Pinpoint Test O: The Heated Seat Is Inoperative/Does Not Operate Correctly - Front Passenger
Seats
Pinpoint Tests
Pinpoint Test O: The Heated Seat is Inoperative/Does Not Operate Correctly - Front Passenger
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The heated seat module receives ignition voltage on circuit CBX06 (GY/RD). When ignition voltage is supplied and a heated seat button on the Front Controls Interface Module (FCIM) is pressed, the Medium Speed Controller Area Network (MS-CAN) communicates the command to the HVAC module. The HVAC module then sends a momentary ground to the passenger command circuit (CHS30 GY/YE) to turn the heated seat on. Upon receiving a command, the heated seat module will decrease one setting (the sequence is high, low, off, high, etc.). The heated seat module supplies voltage to the cushion and backrest heater mats on circuit CHS07 (GY/BU). Ground to the heater mats is provided on circuit GD904 (BK/BU). The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by heated seat module using a sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor on circuit VHS27 (WH/OG) and monitors the signal from the temperature sensor for controlling current flow to the heater mats. The heated seat module is designed to remain on, heating the seat and maintaining temperature until switched off. After a fault is set in the heated seat module, it is reset by cycling the ignition OFF and ON.
- DTC B1032:12 Right Front Seat Heater: Circuit Short To Battery - If the passenger 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 B1032:14 Right Front Seat Heater: Circuit Short To Ground or Open - If the passenger 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:
- Fuse(s)
- Wiring, terminals or connectors
- Backrest or cushion heater mat
- Heated seat module
- HVAC module
- FCIM
- Controller Area Network (CAN)
PINPOINT TEST O: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - FRONT PASSENGER
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.
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O1 CHECK HEATED SEAT OPERATION
- Ignition OFF.
- Start the engine.
- Verify the driver heated seat is operational.
- Is the driver heated seat operational?
Yes
GO to O2.
No
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 - driver. Symptom Related Diagnostic Procedures
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O2 CHECK HEATED SEAT INDICATOR ILLUMINATION
- Verify system indicator illumination.
- Do the passenger heated seat indicators illuminate or flash and then turn off?
Yes
GO to O8.
No
GO to O3.
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O3 CHECK THE FCIM FOR DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any FCIM DTCs retrieved?
Yes
For all FCIM DTCs, REFER to the Master DTC Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart
No
GO to O4.
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O4 RETRIEVE THE HVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Are any HVAC module DTCs retrieved?
Yes
If DTC B1032:12, GO to O18.
If DTC B1032:14, GO to O19.
For any other HVAC module DTCs, REFER to the HVAC Module DTC Chart.
No
For vehicles without navigation, GO to O5.
For vehicles with navigation, GO to O6.
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O5 CHECK THE HVAC FUNCTIONS
NOTE: The purpose of this step is to verify the HVAC module is able to receive and process inbound command messages from the communication bus and demonstrate the HVAC module is operational. This indicates the FCIM buttons may not be sending the commands correctly.
- Operate the HVAC system using the buttons on the FCIM and check for correct HVAC function.
- Does the HVAC system function correctly?
Yes
INSTALL a new FCIM. TEST the system for normal operation.
No
REFER to Heating and Air Conditioning to diagnose the HVAC concern.
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O6 MONITOR THE FCIM PIDs AND CHECK INPUTS
- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs.
- Passenger Heated Seat (CC_SW_P_HSEATS)
- Monitor the FCIM PIDs while pushing the passenger heated seat button.
- Do the PID values agree with the switch button positions?
Yes
GO to O7.
No
INSTALL a new FCIM. TEST the system for normal operation.
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O7 MONITOR THE HVAC MODULE PIDs AND CHECK INPUTS
- Enter the following diagnostic mode on the scan tool: DataLogger - HVAC Module - PIDs.
- Right Seat Heater (ST_HEAT_RT)
- NOTE: The PID data will quickly flicker on and off. Watch closely when pressing the FCIM buttons.
- Monitor HVAC module PIDs while pushing the passenger heated seat button.
- Do the PID values agree with the switch button positions?
Yes
If 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.
No
INSTALL a new HVAC module. TEST the system for normal operation.
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O8 CHECK THE VOLTAGE TO THE HEATED SEAT MODULE PASSENGER CIRCUIT
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures of Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C3137.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359b.
- 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.
- Measure the voltage between heated seat module C359b-3, circuit CBX01 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to O9.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O9 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Heated Seat Module C359a.
- Disconnect: Passenger Seat Cushion Heater Mat C334.
- Measure the voltage between heated seat module C359a-9, circuit VHS27 (WH/OG), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. GO to O13 to check the temperature sensor for damage. If OK, TEST the system for normal operation. If not OK, INSTALL a new passenger seat cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
No
GO to O10.
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O10 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between:
- heated seat module C359a-9, circuit VHS27 (WH/OG), harness side and seat cushion heater mat C334-2, circuit VHS27 (WH/OG), harness side.
- heated seat module C359a-9, circuit VHS27 (WH/OG), harness side and ground.
- Is the resistance less than 5 ohms between C359a-9 and C334-2, and greater than 10,000 ohms between C359a-9 and ground?
Yes
GO to O11.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O11 CHECK TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between heated seat module C359a-12, circuit RHS05 (YE/VT), harness side and passenger seat cushion heater mat C334-3, circuit RHS05 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to O12.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O12 CHECK HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN
- Measure the resistance between heated seat cushion C334 pin 2 and pin 3, component side.
- Is the resistance between 300 ohms and 300,000 ohms?
Yes
GO to O13.
No
INSTALL a new seat cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O13 CHECK PASSENGER SEAT HEATER MAT CIRCUIT
- Connect: Passenger Seat Cushion Heater Mat C334.
- Measure the resistance between heated seat module C359b-6, circuit CHS07 (GY/BU), harness side and ground.
- Is the resistance between 1.2 and 4 ohms?
Yes
GO to O21.
No
GO to O14.
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O14 CHECK CUSHION HEATER MAT CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Passenger Seat Cushion Heater Mat C334.
- Measure the resistance between:
- heated seat module C359b-6, circuit CHS07 (GY/BU), harness side and passenger seat cushion heater mat C334-1, circuit CHS07 (GY/BU), harness side.
- heated seat module C359b-6, circuit CHS07 (GY/BU), harness side and ground.
- Is the resistance less than 5 ohms between C359b-6 and C334-1, and greater than 10,000 ohms between C359b-6 and ground?
Yes
GO to O15.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O15 CHECK PASSENGER SEAT CUSHION HEATER MAT FOR AN OPEN
- Measure the resistance between passenger seat cushion heater mat C334 pins 1 and 4, component side.
- Is the resistance between 0.6 and 2 ohms?
Yes
GO to O16.
No
INSTALL a new passenger seat cushion heater mat. REFER to Seat Cushion Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O16 CHECK CUSHION HEATER MAT CIRCUIT FOR AN OPEN
- Disconnect: Passenger Seat Backrest Heater Mat C335.
- Measure the resistance between seat cushion heater mat C334-4, circuit CHS01 (GY/VT), harness side and seat backrest heater mat C335-1, circuit CHS01 (GY/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to O17.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O17 CHECK THE BACKREST HEATER MAT FOR AN OPEN
- Measure the resistance between passenger seat backrest heater mat C335 pins 1 and 2, component side.
- Is the resistance between 0.6 and 2 ohms?
Yes
REPAIR circuit GD904 (BK/BU). TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
No
INSTALL a new passenger seat backrest heater mat. REFER to Seat Backrest Heater Mat - Front Seat Backrest Heater Mat - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O18 CHECK HEATED SEAT MODULE ON/OFF CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures of Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C3137.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359a.
- Disconnect: HVAC Module C228a.
- 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.
- Ignition ON.
- Measure the voltage between heated seat module C359a-8, circuit CHS30 (GY/YE), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
No
INSTALL a new HVAC module. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O19 CHECK HEATED SEAT MODULE ON/OFF CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures of Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C3137.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C359a.
- Disconnect: HVAC Module C228a.
- 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.
- Measure the resistance between heated seat module C359a-8, circuit CHS30 (GY/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to O20.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O20 CHECK HEATED SEAT MODULE ON/OFF CIRCUIT FOR AN OPEN
- Measure the resistance between heated seat module C359a-8, circuit CHS30 (GY/YE), harness side and HVAC module C228a-4, circuit CHS30 (GY/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new HVAC module. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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O21 CHECK THE HVAC MODULE OUTPUT
- Connect: Heated Seat Module C359a.
- Connect: Heated Seat Module C359b.
- Ignition ON.
- NOTE: The following measurement must be taken by back-probing the heated seat module C359a.
- NOTE: The voltage on circuit CHS30 (GY/YE) should drop momentarily when the passenger heated seat control button is pressed.
- Measure the voltage between heated seat module C359a-8, circuit CHS30 (GY/YE), harness side and ground by back-probing heated seat module C359a-8. Press the passenger heated seat control button and note the voltage.
- Is the voltage greater than 10 volts before pressing the passenger heated seat control button, then momentarily drops when the heated seat control button is pressed?
Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
No
If the voltage is greater than 10 volts but did not drop when the passenger heated seat button was pressed, INSTALL a new HVAC module.
If the voltage is less than 10 volts, INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front.
TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Air Bag Systems.
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