Generic Electronic Module (GEM) (Electrical equipment / Electronic Function Group / Ford Focus 1 1998-2004)

Operating principle

NOTE: After installing a new common electronic module (GEM) you need to configure it. See Section 418-01 for more information.

GEM constantly monitors all subsystems for problems. If a problem is detected in one of the subsystems, GEM will record information about the problem in the form of a diagnostic trouble code (DTC). The position of the ignition switch is very important for the GEM function. Often erratic or unexpected GEM operation can be traced to problems with ignition switch inputs.

Inspection and verification

1. Check the customer's complaint.

2. Visually inspect for obvious signs of electrical damage.

Visual Inspection Table

Electrical factors:

Fuse (And) central electrical box (CJB)
Wiring harness
Plug connector (s).
Electrical circuit (And)

3. If the problem persists after inspection, connect the diagnostic connector to the data link connector (DLC), located under the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:

check if the program card is installed correctly.
check the connections going to the car.
check the position of the ignition switch.

4. If the scan tool still does not communicate with the vehicle, refer to the service manual for the scan tool.

5. Run a DATA LINK diagnostic test. If the scan tool responds:

CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, See Section 418-00 for more information.
NO RESPONSE/NOT EQUIP for GEM, Go to PINPOINT TEST E.
SYSTEM PASSED, retrieve and record persistent DTCs (DTC), clear persistent DTCs, and run the GEM Self-Test Diagnosis.

6. If the retrieved DTCs are related to the problem, go to the Diagnostic Trouble Code Index (DTC).

7. If no problem-related DTCs are retrieved, refer to the appropriate section of the Workshop Manual to continue diagnosis.

Table of diagnostic trouble codes (DTC)

DTC	Name	Reason	Actions
B1202	Fuel sensor open circuit	Dashboard	See Section 413-01 for more information.
B1204	Short circuit of the fuel sensor electrical circuit to ground	Dashboard	See Section 413-01 for more information.
B1231	Longitudinal acceleration threshold exceeded	Secondary restraint system control module (RCM)	See Section 501-20A / 501-20B for more information.
B1244	Rear Window Wiper Motor Run Relay Circuit Malfunction	GEM	See Section 501-16 for more information.
B1245	Short circuit to + battery electrical circuit of the rear window wiper motor relay	GEM	See Section 501-16 for more information.
B1300	Power door lock circuit malfunction	GEM	See Section 501-14 for more information.
B1309	Short circuit in the electric door lock circuit with an electric drive to ground	GEM	See Section 501-14 for more information.
B1310	Power Door Unlock Electrical Circuit Malfunction	GEM	See Section 501-14 for more information.
B1315	Short to ground in the electrical circuit of the battery saver relay coil	GEM	See Section 417-02 for more information.
B1316	Short to ground in the electrical circuit of the battery saver relay coil	GEM	See Section 417-02 for more information.
B1317	High battery voltage	Dashboard	See Section 414-01 for more information.
B1317	High battery voltage	Anti-Lock Braking System Module (ABS)	See Section 414-01 for more information.
B1318	Low battery voltage	Dashboard	See Section 414-01 for more information.
B1318	Low battery voltage	RCM	See Section 414-01 for more information.
B1318	Low battery voltage	ABS module	See Section 414-01 for more information.
B1319	Malfunction of the electric circuit of loose closing of the door	GEM	See Section 417-02 for more information.
B1325	Short circuit to ground in the electrical circuit of the lamp of loose closing of the door	GEM	See Section 417-02 for more information.
B1326	Short circuit to ground in the electrical circuit of the lamp of loose closing of the door	GEM	See Section 417-02 for more information.
B1327	Passenger Door Loose Close Electrical Circuit Malfunction	GEM	See Section 417-02 for more information.
B1331	Trunk Lid Loose Closing Electrical Circuit Malfunction	GEM	See Section 417-02 for more information.
B1335	Right Rear Door Loose Close Electrical Circuit Malfunction	GEM	See Section 417-02 for more information.
B1341	Short to ground in the power door unlock circuit	GEM	See Section 501-14 for more information.
B1342	Instrument panel defective	Dashboard	CLEAR DTCs. REPEAT the self test. If DTC B1342 is retrieved, INSTALL a new instrument panel. See Section 413-01 for more information. CLEAR DTCs. REPEAT the self test.
B1342	RCM is faulty	RCM	CLEAR DTCs. REPEAT the self test. If DTC B1342 is retrieved, INSTALL a new RCM. See Section 501-20A / 501-20B for more information. CLEAR DTCs. REPEAT the self test.
B1342	ABS module defective	ABS module.	CLEAR DTCs. REPEAT the self test. If DTC B1342 is retrieved, INSTALL a new ABS module. See Section 206-09A / 206-09B / 206-09C for more information. CLEAR DTCs. REPEAT the self test.
B1342	GEM is faulty	GEM	CLEAR DTCs. REPEAT the self test. If DTC B1342 is retrieved, INSTALL a new GEM. REFER to ch. "General electronic module" presented in this section. CLEAR DTCs. REPEAT the self test.
B1343	Rear Window Heated Window Input Circuit Malfunction	GEM	See Section 501-11 for more information.
B1349	Short circuit to + battery electrical circuit of the rear window defroster relay	GEM	See Section 501-11 for more information.
B1350	Short to ground in the electrical circuit of the rear window heating relay	GEM	See Section 501-11 for more information.
B1352	Ignition Key Presence Circuit Malfunction	GEM	See Section 413-09 for more information.
B1359	Run/Acc Electrical Circuit Malfunction (Work / accessories) ignition	Dashboard	See Section 413-01 for more information.
B1426	Short circuit on + of the accumulator of an electric chain of a control lamp of seat belts	GEM	See Section 413-00 for more information.
B1428	Seat Belt Warning Light Circuit Malfunction	GEM	See Section 413-00 for more information.
B1438	Wiper Select Switch Electrical Circuit Malfunction	GEM	See Section 501-16 for more information.
B1446	Wiper park position sensing electrical circuit malfunction	GEM	See Section 501-16 for more information.
B1451	Wiper/washer delay switch circuit malfunction	GEM	See Section 501-16 for more information.
B1462	Seat Belt Switch Malfunction	RCM	See Section 501-20A / 501-20B for more information.
B1470	Headlight warning lamp input circuit malfunction	GEM	See Section 417-01 for more information.
B1499	Malfunction of an electric chain of a control lamp of the left index of turn	GEM	See Section 417-01 for more information.
B1503	Malfunction of an electric chain of a control lamp of the right index of turn	GEM	See Section 417-01 for more information.
B1519	Hood switch circuit malfunction	GEM	See Section 419-01A / 419-01B for more information.
B1549	Short circuit to + battery of the main switch of the electric drive of the elevators	GEM	See Section 501-11 for more information.
B1550	Short circuit to ground of the main switch of the electric drive of the lifts	GEM	See Section 501-11 for more information.
B1551	Trunk Lid Unlock Circuit Malfunction	GEM	See Section 501-14 for more information.
B1553	Short to battery + trunk lid release circuit	GEM	See Section 501-14 for more information.
B1554	Short to ground in the trunk lid release circuit	GEM	See Section 501-14 for more information.
B1571	Left Rear Door Loose Close Electrical Circuit Malfunction	GEM	See Section 417-02 for more information.
B1611	Rear window wiper switch malfunction	GEM	See Section 501-16 for more information.
B1810	Reverse Lamp Switch Input Circuit Malfunction	GEM	See Section 417-01 for more information.
B1869	Rupture of an electric chain of a control lamp of airbags	RCM	See Section 501-20A / 501-20B for more information.
B1870	Short to + battery airbag warning light circuit	RCM	See Section 501-20A / 501-20B for more information.
B1871	Passenger Airbag Deactivation Module Malfunction	RCM	See Section 501-20A / 501-20B for more information.
B1875	Turn Signal/Hazard Light Switch Electrical Circuit Malfunction	GEM	See Section 417-01 for more information.
B1876	Driver Belt Pretensioner Electrical Circuit Malfunction	GEM	See Section 501-20A / 501-20B for more information.
B1876	Driver Belt Pretensioner Electrical Circuit Malfunction	RCM	See Section 501-20A / 501-20B for more information.
B1877	Break in the electrical circuit of the driver's seat belt tensioner	RCM	See Section 501-20A / 501-20B for more information.
B1878	Short to battery + driver's seat belt pretensioner circuit	RCM	See Section 501-20A / 501-20B for more information.
B1880	Passenger Belt Pretensioner Electrical Circuit Malfunction	RCM	See Section 501-20A / 501-20B for more information.
B1881	Passenger seat belt pretensioner electrical circuit open	RCM	See Section 501-20A / 501-20B for more information.
B1882	Short to battery + passenger seat belt pretensioner circuit	RCM	See Section 501-20A / 501-20B for more information.
B1885	Driver seat belt pretensioner igniter circuit low resistance	RCM	See Section 501-20A / 501-20B for more information.
B1886	Passenger Pretensioner Igniter Circuit Low Resistance	RCM	See Section 501-20A / 501-20B for more information.
B1915	Driver's Airbag Electrical Circuit Malfunction	RCM	See Section 501-20A / 501-20B for more information.
B1916	Short to battery + driver airbag circuit	RCM	See Section 501-20A / 501-20B for more information.
B1920	Passenger Airbag Circuit Malfunction	RCM	See Section 501-20A / 501-20B for more information.
B1925	Short to battery + passenger airbag circuit	RCM	See Section 501-20A / 501-20B for more information.
B1932	Break in the electrical circuit of the driver's airbag	RCM	See Section 501-20A / 501-20B for more information.
B1933	Passenger airbag open circuit	RCM	See Section 501-20A / 501-20B for more information.
B1934	Driver Airbag Inflator Igniter Circuit Low Resistance	RCM	See Section 501-20A / 501-20B for more information.
B1935	Passenger Airbag Inflator Igniter Circuit Low Resistance	RCM	See Section 501-20A / 501-20B for more information.
B1936	Short to ground in the driver's airbag circuit	RCM	See Section 501-20A / 501-20B for more information.
B1938	Short to ground in passenger airbag circuit	RCM	See Section 501-20A / 501-20B for more information.
B1992	Short to battery + driver side airbag circuit	RCM	See Section 501-20A / 501-20B for more information.
B1993	Short to ground in driver's side airbag electrical circuit	RCM	See Section 501-20A / 501-20B for more information.
B1994	Break in the electrical circuit of the side airbag on the driver's side	RCM	See Section 501-20A / 501-20B for more information.
B1995	Driver Side Airbag Igniter Circuit Low Resistance	RCM	See Section 501-20A / 501-20B for more information.
B1996	Short to battery + passenger side airbag circuit	RCM	See Section 501-20A / 501-20B for more information.
B1997	Short to ground in passenger side airbag electrical circuit	RCM	See Section 501-20A / 501-20B for more information.
B1998	Break in the electrical circuit of the side airbag on the driver's side	RCM	See Section 501-20A / 501-20B for more information.
B1999	Driver Side Airbag Igniter Circuit Low Resistance	RCM	See Section 501-20A / 501-20B for more information.
B2107	Short to battery + windshield wiper motor relay circuit	GEM	See Section 501-16 for more information.
B2108	Trunk Lock Cylinder Switch Malfunction	GEM	See Section 501-14 for more information.
B2110	Rupture of an electric chain of the relay of the electric motor of cleaners of a windshield	GEM	See Section 501-16 for more information.
B2112	Driver's Door Setting Switch Stuck Malfunction	GEM	See Section 501-14 for more information.
B2113	Short to ground in heated windshield input circuit	GEM	See Section 501-16 for more information.
B2114	Short to ground in the windshield washer input circuit	GEM	See Section 501-16 for more information.
B2115	Short circuit on "weight" of an input signal of a washer of glass of a back window	GEM	See Section 501-16 for more information.
B2116	Driver's Door Reset Switch Stuck Fault	GEM	See Section 501-14 for more information.
B2117	Driver Side Airbag Igniter Low Capacity	RCM	See Section 501-20A / 501-20B for more information.
B2118	Passenger Side Airbag Igniter Low Capacity	RCM	See Section 501-20A / 501-20B for more information.
B2141	NVM memory error	RCM	See Section 501-20A / 501-20B for more information.
B2143	NVM memory error	Dashboard	See Section 413-01 for more information.
B2226	Front impact sensor internal fault	RCM	See Section 501-20A / 501-20B for more information.
B2227	Malfunction in the transmission of data to the driver from the front shock sensor	RCM	See Section 501-20A / 501-20B for more information.
B2228	Short to ground in the driver's airbag circuit - Loop #2	RCM	See Section 501-20A / 501-20B for more information.
B2229	Short to ground in the passenger airbag circuit - Circuit No. 2	RCM	See Section 501-20A / 501-20B for more information.
B2230	Short to battery + driver airbag circuit - Loop #2	RCM	See Section 501-20A / 501-20B for more information.
B2231	Short to ground in the passenger airbag circuit - Circuit No. 2	RCM	See Section 501-20A / 501-20B for more information.
B2232	Break in the electrical circuit of the driver's airbag - Circuit No. 2	RCM	See Section 501-20A / 501-20B for more information.
B2233	Passenger airbag open circuit - Circuit #2	RCM	See Section 501-20A / 501-20B for more information.
B2234	Driver Airbag Inflator Igniter Circuit Low Resistance - Circuit #2	RCM	See Section 501-20A / 501-20B for more information.
B2235	Passenger Airbag Inflator Igniter Circuit Low Resistance - Circuit #2	RCM	See Section 501-20A / 501-20B for more information.
B2248	Windshield Heated Relay Coil Circuit Malfunction	GEM	See Section 501-11 for more information.
B2256	Short to ground in the electrical circuit of the heated windshield relay	GEM	See Section 501-11 for more information.
B2279	Short to battery + engine signal circuit	GEM	See Powertrain Diagnostic Guide (PC/ED).
B2281	Short to ground on the right turn signal switch	GEM	See Section 417-01 for more information.
B2282	Short to ground on left turn signal switch	GEM	See Section 417-01 for more information.
B2283	Short circuit on + of the battery of a sound signal of the index of turn	GEM	See Section 417-01 for more information.
B2284	Short circuit on "weight" of a sound signal of the index of turn	GEM	See Section 417-01 for more information.
B2369	Short circuit on "weight" of request of a sound signal	GEM	See Section 501-20A / 501-20B for more information.
B2433	Short to battery + driver seat belt buckle switch circuit	RCM	See Section 501-20A / 501-20B for more information.
B2434	Short to ground in driver's seat belt buckle switch circuit	RCM	See Section 501-20A / 501-20B for more information.
B2435	Driver's seat belt buckle switch circuit resistance out of range	RCM	See Section 501-20A / 501-20B for more information.
B2437	Short to + battery passenger seat belt buckle switch circuit	RCM	See Section 501-20A / 501-20B for more information.
B2438	Short to ground in passenger seat belt buckle switch circuit	RCM	See Section 501-20A / 501-20B for more information.
B2439	Passenger seat belt buckle switch circuit resistance out of range	RCM	See Section 501-20A / 501-20B for more information.
B2477	Module configuration error	Dashboard	See Section 418-01 for more information.
B2477	Module configuration error	RCM	See Section 418-01 for more information.
B2494	Short circuit to + battery in the anti-theft alarm horn output circuit	GEM	See Section 419-01A / 419-01B for more information.
B2496	Short circuit "weight" of the electrical circuit of the output signal of the audible signal of the anti-theft alarm	GEM	See Section 419-01A / 419-01B for more information.
B2555	Short to battery + ceiling lamp output circuit	GEM	See Section 417-02 for more information.
B2852	Short circuit on "weight" / + of the accumulator of an electric circuit of the right additional gauge	RCM	See Section 501-20A / 501-20B for more information.
B2853	Short circuit on "weight" / + of the accumulator of an electric circuit of the left additional gauge	RCM	See Section 501-20A / 501-20B for more information.
B2854	Left impact sensor identification fault	RCM	See Section 501-20A / 501-20B for more information.
B2855	Short to ground / battery + front shock sensor circuit	RCM	See Section 501-20A / 501-20B for more information.
B2856	Front impact sensor identification fault	RCM	See Section 501-20A / 501-20B for more information.
B2873	Internal malfunction of the left shock sensor	RCM	See Section 501-20A / 501-20B for more information.
B2874	Internal malfunction of the right shock sensor	RCM	See Section 501-20A / 501-20B for more information.
B2875	Right impact sensor identification fault	RCM	See Section 501-20A / 501-20B for more information.
C1095	ABS hydraulic pump motor electrical circuit malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1141	Malfunction consisting in the absence of teeth on the impulse wheel of the speed sensor of the left front wheel	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1142	Malfunction consisting in the absence of teeth on the impulse wheel of the speed sensor of the right front wheel	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1143	Malfunction consisting in the absence of teeth on the impulse wheel of the left rear wheel speed sensor	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1144	Malfunction consisting in the absence of teeth on the impulse wheel of the right rear wheel speed sensor	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1145	Right Front Wheel Speed Input Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1155	Left Front Wheel Speed Input Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1165	Right Rear Wheel Speed Input Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1175	Left Rear Wheel Speed Input Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1233	LH Front Wheel Speed Input Missing	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1234	No right front wheel speed input,	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1235	No right rear wheel speed input	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1236	Left rear wheel speed input missing	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1267	Temporary disablement of ABS functions	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1277	Malfunction of electric circuits 1 and 2 of the angle of rotation of the steering wheel	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1278	Malfunction in giving of signals 1 and 2 angles of rotation of a steering wheel	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1279	Yaw Rate Sensor Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1280	Yaw rate sensor signal failure	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1281	Transverse Accelerometer Electrical Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1282	Transverse accelerometer signal failure	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1288	Main Pressure Sensor Input Circuit Malfunction	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1730	Reference voltage out of operating range (+5V)	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
C1947	Short to ground in seat rail position switch circuit	RCM	See Section 501-20A / 501-20B for more information.
C1948	Seat rail position switch circuit resistance out of range	RCM	See Section 501-20A / 501-20B for more information.
C1982	Short to battery + seat rail position switch circuit	RCM	See Section 501-20A / 501-20B for more information.
P1197	Mileage Switch Electrical Circuit Malfunction	Dashboard	See Section 413-01 for more information.
P1778	Transmission reverse I/P electrical circuit malfunction	GEM	See Section 413-01 for more information.
U1009	Invalid or Missing SCP Bus Data (J1850) for engine torque	ABS module	See Section 206-09A / 206-09B / 206-09C for more information.
U1027	Invalid or missing data for engine speed	Dashboard	See Powertrain Diagnostic Guide (PC/ED).
U1027	Invalid or Missing SCP Bus Data (J1850) for engine speed	ABS module	See Powertrain Diagnostic Guide (PC/ED).
U1041	Invalid or missing vehicle speed data	Dashboard	See Powertrain Diagnostic Guide (PC/ED).
U1073	Invalid or missing engine coolant data	Dashboard	See Powertrain Diagnostic Guide (PC/ED).
U1123	Invalid or missing data for the odometer	Dashboard	See Section 413-01 for more information.
U1262	Data bus failure	Dashboard	See Section 418-00 for more information.
U2027	Malfunction of transmission of data of the left shock sensor (Not SCP)	RCM	See Section 501-20A / 501-20B for more information.
U2028	Malfunction of transmission of data of the right shock sensor (Not SCP)	RCM	See Section 501-20A / 501-20B for more information.

Symptom table

State

Possible Causes

Action

• No communication with common electronic module (GEM)

•Fuse (And) CJB

•Electrical circuit (And).

• GEM

• Go to PINPOINT TEST E.

PINPOINT TEST E: NO COMMUNICATION WITH COMMON ELECTRONIC MODULE (GEM)

STATES	DETAILS/RESULTS/ACTIONS
E1: IGNITION STATUS CHECK - PID GEM PARAMETER MONITORING: IGN_A, IGN_O/L, IGN_R, AND IGN_S
	1 Enter the OFF position.
	2 Connect the diagnostic tool.
	3 Monitor the GEM PIDs: IGN_A, IGN_O/L, IGN_R, and IGN_S as the ignition switch is turned through the START, RUN, OFF, and ACC positions.
	• Do the PID GEM values match the ignition switch positions?
	→ Yes
	Go to E2.
	→ No
	REPAIR the ignition circuit in question (RUN/ACC: electrical circuit 155-AA17 (black and yellow), KEY IN: IN 305-TA31A (red-black), idle position electrical circuit 315-TA3232 (black and white)). CLEAR DTCs. REPEAT the self test.
E2: 29-DK20 ELECTRICAL CIRCUIT CHECK (ORANGE GREEN) AND ELECTRIC CIRCUIT 29-M11 (ORANGE-WHITE) FOR VOLTAGE
	1 Enter the OFF position.
	2 Disconnect C103 GEM..
	3 Measure the voltage between pin 5 of connector C103 GEM, circuit 29-DK20 (orange green), wiring side, and ground and pin 1 of connector C103 GEM, circuit 29-AA17 (orange white), from the wiring side, and "ground".
	• Is the voltage greater than 10 V?
	→ Yes
	Go to E3.
	→ No
	REPAIR electrical circuits. CLEAR DTCs. REPEAT the self test.
E3: GEM 31-DK20 ELECTRICAL CIRCUIT CHECK (BLACK) FOR A BREAK
	1 Disconnect C101 GEM.
	2 Measure the resistance between pin 5 of connector C101 GEM, circuit 31-DK20 (black), from the wiring side, and "ground".
	• Is the resistance less than 5 ohms?
	→ Yes
	Go to E4.
	→ No
	REPAIR the electrical circuit. CLEAR DTCs. REPEAT the self test.
E4: GEM 91-DK20 ELECTRICAL CIRCUIT CHECK (BLACK-RED) FOR A BREAK
	1 Measure the resistance between pin 1 of connector C104 GEM, circuit 91-DK20 (black and red), from the wiring side, and "ground".
	• Is the resistance less than 5 ohms?
	→ Yes
	INSTALL a new GEM. REFER to ch. "General electronic module" presented in this section. CLEAR DTCs. REPEAT the self test.
	→ No
	REPAIR the electrical circuit. CLEAR DTCs. REPEAT the self test.

Generic Electronic Module (GEM)

Operating principle

Inspection and verification

Visual Inspection Table

Table of diagnostic trouble codes (DTC)

Symptom table

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