NOTE: Use a digital multimeter to make all electrical measurements.
PINPOINT TEST A: POWER SEAT DOES NOT WORK
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STATES |
DETAILS/RESULTS/ACTIONS |
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A1: CHECK VOLTAGE SUPPLIED TO POWER SEAT SWITCH |
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1 Enter the OFF position. |
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2 Disconnect the Power Seat Switch inoperative. |
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3 Drive the ON position. |
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4 Measure the voltage between: NOTE:Power driver's seat - LHD. - pin 2 C715 power seat switch, circuit 29-AH6 (orange/yellow), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured before 12/1999. - pin 2 C716 power seat switch, circuit 29-AH14 (orange/yellow), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured since 01/2000. - pin 2 C715 power seat switch, circuit 29-AH6 (orange/yellow), from the wiring side, and "weight". |
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• Is the voltage over 10 V? |
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→ Yes |
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Go to A2. |
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→ No |
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REPAIR Circuit 29-AH6 (orange/yellow) or electrical circuit 29-AH14 (orange/yellow). CHECK the system is working properly. |
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A2: INSPECT POWER SEAT SWITCH GROUND CIRCUIT FOR OPEN |
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1 Enter the OFF position. |
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2 Measure the resistance between: NOTE:Power driver's seat - LHD. - pin 3 C715 of the power seat switch, circuit 31-AH6 (black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured before 12/1999. - pin 3 C716 of the power seat switch, circuit 31-AH14 (black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured since 01/2000. - pin 3 C715 of the power seat switch, circuit 31-AH6 (black), from the wiring side, and "weight". |
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• Is the resistance less than 5 ohms? |
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→ Yes |
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Go to A3. |
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→ No |
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REPAIR Circuit 31-AH6 (black) or electrical circuit 31-AH14 (black). CHECK the system is working properly. |
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A3: CHECK LOWER CIRCUIT VOLTAGE SUPPLIED TO ELECTRIC SEAT HEIGHT ADJUST MOTOR |
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1 Connect the inoperative power seat switch. |
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2 Disconnect the Power Seat Height Adjust Motor. |
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3 Drive the ON position. |
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4 Push the power seat switch to the DOWN position. |
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5 Measure the voltage between: NOTE:Power Driver Seat - LHD - pin 1 C761 electric seat height adjustment motor, circuit 32-AH10 (white/black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured before 12/1999. - pin 1 C760 electric seat height adjustment motor, circuit 32-AH18 (white/black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured since 01/2000. - pin 1 C761 electric seat height adjustment motor, circuit 32-AH10 (white/black), from the wiring side, and "weight". |
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• Is the voltage over 10 V? |
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→ Yes |
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Go to A4. |
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→ No |
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REPAIR Circuit 32-AH10 (white/black) or electrical circuit 32-AH18 (white/black). CHECK the system is working properly. |
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A4: CHECK LIFT CIRCUIT VOLTAGE SUPPLIED TO ELECTRIC SEAT HEIGHT ADJUST MOTOR |
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1 Push the power seat switch to the UP position. |
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2 Measure the voltage between: NOTE:Power Driver Seat - LHD - pin 2 C761 electric seat height adjustment motor, circuit 33-AH10 (yellow/black), from the wiring side, and "weight" NOTE:Power driver's seat - RHD. - Vehicles manufactured before 12/1999. - pin 2 C760 electric seat height adjustment motor, circuit 33-AH18 (yellow/black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Vehicles manufactured since 01/2000. - pin 2 C761 electric seat height adjustment motor, circuit 33-AH10 (yellow/black), from the wiring side, and "weight" |
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• Is the voltage over 10 V? |
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→ Yes |
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INSTALL a new power seat height adjustment motor. CHECK the system is working properly. |
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→ No |
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REPAIR Circuit 33-AH10 (yellow/black) or electrical circuit 33-AH18 (yellow/black). CHECK the system is working properly. |
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PINPOINT TEST B: SEAT HEATING DOES NOT WORK
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STATES |
DETAILS/RESULTS/ACTIONS |
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B1: CHECK THE SWITCH VOLTAGE SUPPLIED TO THE HEATED SEAT SWITCH |
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1 Drive the ON position. |
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2 Press the seat heating switch. |
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• Is the seat heating switch LED on? |
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→ Yes |
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Go to B2. |
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→ No |
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Go to B6. |
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B2: CHECK THE SWITCH VOLTAGE SUPPLIED TO HEATED SEAT OUT OF WORK MATS |
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1 Enter the OFF position. |
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2 Detach the non-functioning heated seat. |
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3 Drive the ON position. |
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4 Press the seat heating switch. |
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5 Measure the voltage between: NOTE:Power driver's seat - LHD. - Measure the voltage between pin 1 C30 heated seat cushion, circuit 15S-HC8 (green/red), from the wiring side, and "weight". NOTE: Power Passenger Seat - LHD. - Measure the voltage between pin 1 C31 heated seat cushion, circuit 15S-HC111 (green/white), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - Measure the voltage between pin 1 C31 heated seat cushion, circuit 15S-HC11 (green/white), from the wiring side, and "weight". NOTE: Power Passenger Seat - RHD. - Measure the voltage between pin 1 C30 heated seat cushion, circuit 15S-HC8 (green/red), from the wiring side, and "weight". |
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• Is the voltage over 10 V? |
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→ Yes |
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Go to B3. |
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→ No |
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REPAIR circuit 15S-HC8 (green/red) or electrical circuit 15S-HC11 (green/white). CHECK the system is working properly. |
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B3: CHECK SEAT HEATER CUSHION CARPET GROUND CIRCUIT FOR OPEN |
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1 Enter the OFF position. |
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2 Measure the resistance between: NOTE:Power driver's seat - LHD. - measure the resistance between pin 4 C30 of the non-functioning heated seat back, circuit 31-HC8 (black), from the wiring side, and "weight". NOTE: Power Passenger Seat - LHD. - measure the resistance between pin 4 C31 of the backrest of the inoperative heated seat, circuit 31-HC11 (black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - measure the resistance between pin 4 C31 of the backrest of the inoperative heated seat, circuit 31-HC11 (black), from the wiring side, and "weight". NOTE: Power Passenger Seat - RHD. - measure the resistance between pin 4 C30 of the non-functioning heated seat back, circuit 31-HC8 (black), from the wiring side, and "weight". |
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• Is the resistance less than 5 ohms? |
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→ Yes |
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Go to B4. |
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→ No |
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REPAIR Circuit 31-HC8 (black) or electrical circuit 31-HC11 (black). CHECK the system is working properly. |
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B4: INSPECT HEATER SEAT CUSHION CARPET CIRCUIT FOR OPEN |
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1 Measure the resistance of the heating elements: NOTE:Power driver's seat - LHD. - measure the voltage between pin 1 C30 of the inoperative heated seat cushion, circuit 15S-HC8 (green/red), on the side of the element, and pin 2 C30 seat cushion inoperative with heating, electrical circuit 15S-HC7 (green/blue), from the side of the element. NOTE: Power Passenger Seat - LHD. - measure the voltage between pin 1 C31 of the inoperative heated seat cushion, circuit 15S-HC11 (green/white), on the side of the element, and pin 2 C31 of the non-functional heated seat cushion, electrical circuit 15S-HC10 (green/orange), from the side of the element. NOTE:Power driver's seat - RHD. - measure the voltage between pin 1 C31 of the inoperative heated seat cushion, circuit 15S-HC11 (green/white), on the side of the element, and pin 2 C31 of the non-functional heated seat cushion, electrical circuit 15S-H11 (green/orange), from the side of the element. NOTE: Power Passenger Seat - RHD. - measure the voltage between pin 1 30 of the inoperative heated seat cushion, circuit 15S-HC8 (green/red), on the side of the element, and pin 2 C30 seat cushion inoperative with heating, electrical circuit 15S-HC7 (green/blue), from the side of the element. |
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• Resistance is 9 ohms (resistance of one heater mat)? |
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→ Yes |
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Go to B5. |
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→ No |
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INSTALL a new heater mat. CHECK the system is working properly. |
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B5: INSPECT SEAT BACK HEATER MAT CIRCUIT FOR OPEN |
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1 Measure the resistance of the heater elements between: NOTE:Power driver's seat - LHD. - Measure the voltage between pin 3 C30 of the backrest of the inoperative heated seat, circuit 15S-HC7 (green/blue), on the side of the element, and pin 4 C30 of the backrest of the inoperative heated seat, electrical circuit 31-HC8 (black), from the side of the element. NOTE: Power Passenger Seat - LHD. - Measure the voltage between pin 3 C31 of the backrest of the inoperative heated seat, circuit 15S-HC10 (green/orange), on the side of the element, and pin 4 C31 of the backrest of the inoperative heated seat, electrical circuit 31-HC11 (black), from the side of the element. NOTE:Power driver's seat - RHD. - Measure the voltage between pin 3 C31 of the backrest of the inoperative heated seat, circuit 15S-HC10 (green/orange), on the side of the element, and pin 4 C31 of the backrest of the inoperative heated seat, electrical circuit 31-HC11 (black), from the side of the element. NOTE: Power Passenger Seat - RHD. - Measure the voltage between pin 3 C30 of the backrest of the inoperative heated seat, circuit 15S-HC7 (green/blue), on the side of the element, and pin 4 C30 of the backrest of the inoperative heated seat, electrical circuit 31-HC8 (black), from the side of the element. |
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• Resistance is 9 ohms (resistance of one heater mat)? |
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→ Yes |
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REPAIR circuit 15S-HC7 (green/blue) or electrical circuit 15S-HC10 (green/orange). CHECK the system is working properly. |
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→ No |
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INSTALL a new heater mat. CHECK the system is working properly. |
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B6: CHECK THE IGNITION VOLTAGE SUPPLIED TO THE HEATED SEAT SWITCH |
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1 Enter the OFF position. |
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2 Disconnect the inoperative seat heating switch. |
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3 Drive the ON position. |
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4 Measure the voltage between: NOTE:Power Driver Seat - LHD - measure the voltage between pin 2 C694 of the inoperative seat heating switch, circuit 15-HC6 (green/yellow), from the wiring side, and "weight". NOTE: Power Passenger Seat - LHD - measure the voltage between pin 2 C695 of the inoperative seat heating switch, circuit 15-HC9 (green/black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - measure the voltage between pin 2 C695 of the inoperative seat heating switch, circuit 15-HC9 (green/black), from the wiring side, and "weight". NOTE: Power Passenger Seat - RHD - measure the voltage between pin 2 C694 of the inoperative seat heating switch, circuit 15-HC6 (green/yellow), from the wiring side, and "weight". |
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• Is the voltage over 10 V? |
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→ Yes |
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Go to B7. |
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→ No |
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REPAIR Circuit 15-HC6 (green/yellow) or electrical circuit 15-HC9 (green/black). CHECK the system is working properly. |
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B7: INSPECT HEATED SEAT SWITCH GROUND CIRCUIT FOR OPEN |
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1 Enter the OFF position. |
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2 Measure the resistance between: NOTE:Power Driver Seat - LHD - measure the resistance between pin 4 C694 of the inoperative seat heating switch, circuit 31-LH29 (black), from the wiring side, and "weight". NOTE: Power Passenger Seat - LHD - Measure the resistance between pin 4 C695 of the inoperative seat heating switch, circuit 31-LH43 (black), from the wiring side, and "weight". NOTE:Power driver's seat - RHD. - measure the resistance between pin 4 C695 of the inoperative seat heating switch, circuit 31-LH43 (black), from the wiring side, and "weight". NOTE: Power Passenger Seat - RHD - Measure the resistance between pin 4 C694 of the inoperative seat heating switch, circuit 31-LH29 (black), from the wiring side, and "weight". |
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• Is the resistance less than 5 ohms? |
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→ Yes |
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CHECK the legitimacy of the customer's complaint. |
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→ No |
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REPAIR circuit 31-LH29 (black) or electrical circuit 31-LH43 (black). CHECK the system is working properly. |
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