Audio Pinpoint Tests

A1: 29S-GJ1 ELECTRICAL CIRCUIT CHECK (ORANGE-BLUE) FOR A SHORT TO BATTERY POSITIVE TERMINAL

1 Disconnect the Horn Relay.

• Does the buzzer stop when the relay is disconnected?

→ Yes

Go to A2

→ No

REPAIR circuit 29S-GJ1 (orange-blue), by repairing the short to the positive battery terminal. CHECK the system is working properly.

A2: 91S-GJ7 ELECTRICAL CIRCUIT CHECK (BLACK-BLUE) FOR A SHORT TO « GROUND »

1 Using a DMM, measure the resistance between pin 2 of the horn relay, circuit 91S-GJ7 (black and blue), and "mass".

• Is the resistance greater than 10,000 ohms?

→ Yes

INSTALL a new horn relay. CHECK the system is working properly.

→ No

Go to A3

A3: CHECKING THE STEERING WHEEL HORN SWITCH

1 Remove the lower steering column cover.

2 Disconnect the C896 airbag sliding contact.

3 Using a digital multimeter, measure the resistance between pins 1 and 2 of airbag wiper connector C896, component side.

• Is the resistance greater than 10,000 ohms?

→ Yes

Install a new relay. CHECK the system is working properly.

→ No

Go to A4

A4: CHECKING THE STEERING WHEEL HORN SWITCH

WARNING: To properly deactivate the airbag, refer to the procedure in Section 501-20B.

1 Remove the airbag. See Section 501-20A / 501-20B for more information.

2 Disconnect the C920 horn switch.

3 Using a DMM, measure the resistance between pin 1 and pin 2 of the C920 horn switch connector.

• Is the resistance greater than 10,000 ohms?

→ Yes

INSTALL a new airbag slider. CHECK the system is working properly.

→ No

INSTALL a new horn switch (ov). CHECK the system is working properly.

B1: FUSE CHECK 7 (40 A)

1 CHECK Fuse 7 (40 A) CJB.

• Is the audio unit functioning properly?

→ Yes

Navigate to B2

→ No

REPAIR fuse 7. CHECK system for proper operation.

B2: FUSE CHECK 34 (20 A)

1 CHECK Fuse 34 (20 A) CJB.

• Is the fuse good?

→ Yes

Go to B3

→ No

REPAIR fuse 34. CHECK system for proper operation.

B3: HORN RELAY TEST

1 Disconnect the Horn Relay.

2 Check the relay elements. For more information, refer to Horn Relay available in this section..

• Relay OK?

→ Yes

Go to B4

→ No

INSTALL a new horn relay. CHECK the system is working properly.

B4: CJB POWER SUPPLY CHECK

1 Using a DMM, measure the voltage between horn relay pin 1, wiring side, and ground, and pin 3, horn relay, wiring side, and ground.

• Is the voltage always greater than 10 V?

→ Yes

Go to B5

→ No

REPAIR Circuit 30-DA1 (red). CHECK the system is working properly.

B5: HORN SWITCH POWER CHECK

1 Connect the Horn Relay.

2 Disconnect the C896 airbag sliding contact.

3 Remove the lower steering column cover.

4 Using a digital multimeter, measure the voltage between C896 pin 2 of airbag wiper circuit 91S-GJ7 (black and blue), from the wiring side, and "ground".

• Is the voltage greater than 10 V?

→ Yes

Go to B6

→ No

REPAIR circuit 91S-GJ7 (black and blue), CHECK the system is working properly.

B6: HORN SWITCH GROUND ELECTRICAL CHECK

1 Using a digital multimeter, measure the resistance between C896 airbag wiper pin 1, circuit 91-PG30 (black and white), from the wiring side, and "ground".

• Is the resistance less than 5 ohms?

→ Yes

Go to B7

→ No

REPAIR circuit 91-PG30 (black and white), CHECK the system is working properly.

B7: CHECKING THE FUNCTION OF THE AIR BAG SLIDER

1 Using a DMM, measure the resistance between pins 1 and 2 of airbag wiper connector C896, element side. Take readings with the switch pressed and with the switch not pressed.

• Is the resistance greater than 10,000 ohms with the switch off and less than 5 ohms with the switch pressed?

→ Yes

Go to B9

→ No

Go to B8

B8: HORN SWITCH TEST

WARNING: To properly deactivate the airbag, refer to the procedure in Section 501-20B.

1 Remove the airbag. See Section 501-20A / 501-20B for more information.

2 Disconnect the C982 horn switch.

3 Using a DMM, measure the resistance between pins 1 and 2 of connector C982 of the horn switch. Take readings with the switch pressed and with the switch not pressed.

• Is the resistance greater than 10,000 ohms with the switch off and less than 5 ohms with the switch pressed?

→ Yes

Install a new airbag slider. CHECK the system is working properly.

→ No

INSTALL a new switch (And) sound signal. CHECK the system is working properly.

B9: HORN POWER SUPPLY CHECK (OV)

1 Connect the C896 airbag slider.

2 Connect the C920 horn switch.

3 Disconnect the C77 horn.

4 Using a digital multimeter, measure the voltage between C77 pin 1 of the horn (ov), electrical circuit 29S-GJ1 (orange-blue), from the wiring side, and "ground" by pressing the horn switch.

• Is the voltage greater than 10 V?

→ Yes

Go to B10

→ No

REPAIR circuit 29S-GJ1 (orange-white). CHECK the system is working properly.

B10: HORN GROUND ELECTRICAL CIRCUIT CHECK (OV)

1 Using a DMM, measure the resistance between C77 pin 2 of the horn (ov), electric circuit 31-GJ1 (black), from the wiring side, and "ground".

• Is the resistance less than 5 ohms?

→ Yes

INSTALL a new horn (s). CHECK the system is working properly.

→ No

REPAIR Circuit 31-GJ1 (black). CHECK the system is working properly.