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1 Page 1 of 6 Pinpoint Test R: The Heated Seat is Inoperative Driver Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information. rmal Operation The heated seat module receives battery voltage on circuit SBP18. The HVAC module supplies a momentary ground signal to the heated seat module on circuit CHS29 to request the system on/off. The heated seat module supplies voltage to the heater mats on circuit CHS02 and ground is supplied on circuit GD126. The heated seat module monitors the temperature sensor on circuit VHS26. If the temperature sensor circuits open, the heated seat module will disable output voltage to the heater mat. The heated seat module control circuits are monitored by the HVAC module and will set a DTC if a circuit fault is detected. The Front Controls Interface Module (FCIM) (with navigation), HVAC module and heated seat module must be communicating correctly for the system to operate correctly. PIDs are available to check heated seat switch operation in the FCIM (with navigation) and HVAC module (with and without navigation). rmal heat cycle may require several minutes to initially warm the seat. The seat should be occupied to correctly test for normal operation. Temperature measuring devices do not provide an accurate method for testing heated seat operation as surface temperatures are subject to human and environmental characteristics. Correct testing requires heater mat resistance measurements which have tight tolerances affecting the length of time for the heater mats to reach maximum operating temperature. DTC B1030:12 (Left Front Seat Heater: Circuit Short To Battery) If the driver seat control circuit from the HVAC module to the heated seat module is shorted to voltage, the DTC is set in the HVAC module. DTC B1030:14 (Left Front Seat Heater: Circuit Short To Ground or Open) If the driver seat control circuit from the HVAC module to the heated seat module is shorted to ground or open, the DTC is set in the HVAC module. This pinpoint test is intended to diagnose the following: Wiring, terminals or connectors Heater feed circuit short to battery, ground or open Sensor circuit short to battery, ground or open Heated seat switch stuck closed to ground Heater mat Heated seat module HVAC module FCIM (if equipped) PINPOINT TEST R : THE HEATED SEAT IS INOPERATIVE DRIVER NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer. R1 CHECK HEATED SEAT OPERATION Start the engine. Verify the passenger heated seat is operational. Is the passenger heated seat operational? GO to R2. GO to Symptom Chart to diagnose the heated seats are inoperative driver and front passenger or the heated seat is inoperative/does not operate correctly passenger. R2 CHECK HEATED SEAT INDICATOR ILLUMINATION Verify system indicator illumination. Do the driver heated seat indicators illuminate or flash and then turn off? GO to R7. Vehicles with navigation, GO to R3. Vehicles without navigation, GO to R4. R3 RETRIEVE THE FCIM DTCs Enter the following diagnostic mode on the scan tool: Self Test FCIM. Are any FCIM DTCs retrieved? For all FCIM DTCs, REFER to the Master DTC Chart in Section GO to R4. R4 RETRIEVE THE HVAC MODULE DTCs Enter the following diagnostic mode on the scan tool: Self Test HVAC Module. Are any HVAC module DTCs retrieved? If DTC B1030:12, GO to R18. If DTC B1030:14, GO to R19. For any other HVAC module DTCs, REFER to the HVAC Module DTC Chart in this section. For vehicles with navigation, GO to R5. For vehicles without navigation, GO to R6. R5 MONITOR THE DRIVER HEATED SEAT (CC_SW_D_HSEATS) PID AND CHECK INPUTS Enter the following diagnostic mode on the scan tool: DataLogger FCIM PIDs: CC_SW_D_HSEATS.
2 Page 2 of 6 Monitor the FCIM PID while pushing the driver heated seat button. Do the PID states agree with the switch button positions? GO to R6. INSTALL a new FCIM. REFER to Section TEST the system for normal operation. R6 MONITOR THE DRIVER HEATED SEAT (CC_SW_D_HSEATS) PID AND CHECK INPUTS Enter the following diagnostic mode on the scan tool: DataLogger HVAC Module PIDs: CC_SW_D_HSEATS. Monitor the HVAC module PID while pushing the driver heated seat button. Do the PID values agree with the switch button positions? The fault is intermittent, CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion, poor pin contact or pushed-out pins. REPAIR any intermittent concerns found and TIGHTEN any loose connector pins. REPEAT the self-test. CLEAR the DTCs. CHECK the system for normal operation. INSTALL a new HVAC module. REFER to Section TEST the system for normal operation. R7 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section B. Disconnect: Driver Seat Side Air Bag Module C327. Disconnect: Passenger Seat Side Air Bag Module C313. Disconnect: Heated Seat Module C3304b. WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment. Connect the battery ground cable. Refer to Section Measure the voltage between heated seat module C3304B-1, circuit SBP18 (YE/RD) harness side and ground. Is the voltage greater than 10 volts? GO to R8. R8 CHECK THE TEMPERATURE SENSOR OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE Disconnect: Heated Seat Module C3304a. Disconnect: Driver Seat Cushion Heater Mat C364. Measure the voltage between heated seat module C3304A-3, circuit VHS26 (VT), harness side and ground. Is any voltage present? REPAIR the circuit. GO to R11 to check the temperature sensor for damage. If OK, TEST the system for normal operation. If not OK, INSTALL a new driver seat cushion heater mat. REFER to Seat Cushion Front in this section. GO to R9. R9 CHECK THE TEMPERATURE SENSOR OUTPUT CIRCUIT FOR AN OPEN AND SHORT TO GROUND Measure the resistance between: heated seat module C3304A-3, circuit VHS26 (VT), harness side and rear seat cushion heater mat C364-3, circuit VHS26 (VT), harness side. heated seat module C3304A-3, circuit VHS26 (VT), harness side and ground.
3 Page 3 of 6 Is the resistance less than 5 ohms between C3304a-3 and C364-3, and greater than 10,000 ohms between C3304a-3 and ground? GO to R10. R10 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN Measure the resistance between heated seat module C3304A-12, circuit RHS05 (YE/VT), harness side and driver seat cushion heater mat C364-4, circuit RHS05 (YE/VT), harness side. Is the resistance less than 5 ohms? GO to R11. R11 CHECK THE TEMPERATURE SENSOR FOR AN OPEN Measure the resistance between rear heated seat cushion C364 pin 3 and pin 4, component side. Is the resistance between 300 ohms and 300,000 ohms? GO to R12. INSTALL a new cushion heater mat. REFER to Seat Cushion Cover Front in this section. TEST the system for normal operation. R12 CHECK THE HEATER MAT OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage between heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and ground. Is any voltage present? GO to R13.
4 Page 4 of 6 R13 CHECK THE HEATER MAT OUTPUT CIRCUIT FOR AN OPEN AND SHORT TO GROUND Measure the resistance between: heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and cushion heater mat C364-1, circuit CHS02 (YE/BU), harness side. heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and ground. Is the resistance less than 5 ohms between C3304b-4 and C364-1, and greater than 10,000 ohms between C3304b-4 and ground? GO to R14. R14 CHECK THE HEATER MAT RESISTANCE Connect: Driver Seat Backrest Heater Mat C365. Connect: Driver Seat Cushion Heater Mat C364. Measure the resistance between heated seat module C3304B-4, circuit CHS02 (YE/BU), harness side and ground. Is the resistance between 1.2 and 4.0 ohms? GO to R21. GO to R15. R15 CHECK THE CUSHION HEATER MAT FOR AN OPEN Disconnect: Driver Seat Cushion Heater Mat C364. Measure the resistance between driver seat cushion heater mat C364 pins 1 and 2, component side. Is the resistance between 0.6 and 2.0 ohms? GO to R16. INSTALL a new driver seat cushion heater mat. REFER to Seat Cushion Front in this section. TEST the system for normal operation. R16 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND Disconnect: Driver Seat Backrest Heater Mat C365. Measure the resistance between: seat cushion heater mat C364-2, circuit CHS11 (VT/GN), harness side and seat backrest heater mat C365-1, circuit CHS11 (VT/GN), harness side. seat cushion heater mat C364-2, circuit CHS11 (VT/GN), harness side and ground.
5 Page 5 of 6 Is the resistance less than 0.5 ohm? GO to R17. R17 CHECK THE BACKREST HEATER MAT FOR AN OPEN Measure the resistance between driver seat backrest heater mat C365 pins 1 and 2, component side. Is the resistance between 0.6 and 2.0 ohms? REPAIR circuit GD126 (BK/WH) for an open. TEST the system for normal operation. INSTALL a new driver seat backrest heater mat. TEST the system for normal operation. R18 CHECK HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR SHORT TO VOLTAGE Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section B. Disconnect: Passenger Seat Side Air Bag Module C313. Disconnect: Heated Seat Module C3304a. Disconnect: HVAC Module C2356a. WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment. Connect the battery ground cable. Refer to Section Measure the voltage between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and ground. Is any voltage present? DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. INSTALL a new HVAC module. REFER to Section TEST the system for normal operation. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. R19 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR AN OPEN Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section B. Disconnect: Passenger Seat Side Air Bag Module C313. Disconnect: Heated Seat Module C3304a. Disconnect: HVAC Module C2356a. WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment. Connect the battery ground cable. Refer to Section Measure the resistance between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and HVAC module C2356A-5, circuit CHS29 (WH/BU), harness side.
6 Page 6 of 6 Is the resistance less than 5 ohms? GO to R20. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. R20 CHECK THE HEATED SEAT MODULE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND Measure the resistance between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and ground. Is the resistance greater than 10,000 ohms? INSTALL a new heated seat module. REFER to Heated Seat Module in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. R21 CHECK THE HVAC MODULE OUTPUT Connect: Heated Seat Module C3304a and C3304b. NOTE: The following measurement must be taken by back-probing heated seat module C3304a. NOTE: Voltage on circuit CHS29 (WH/BU) should drop momentarily when the driver heated seat control button is pressed. Measure the voltage between heated seat module C3304A-2, circuit CHS29 (WH/BU), harness side and ground by back-probing heated seat module connector. Press the driver heated seat button on the HVAC module and note the voltage. Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed? INSTALL a new heated seat module. REFER to Heated Seat Module in this section. TEST the system for normal operation. If voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new HVAC module. REFER to Section TEST the system for normal operation. If voltage is less than 10 volts, INSTALL a new heated seat module. REFER to Heated Seat Module in this section. TEST the system for normal operation.
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