Pinpoint Test O: The Heated Seat is Inoperative - Front Passenger
Seats
Pinpoint Tests
Pinpoint Test O: The Heated Seat is Inoperative - 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 is supplied with 2 battery voltage inputs (one for the driver seat and one for the passenger seat), a single ignition voltage input and a single ground circuit. If equipped with navigation and the heated seat buttons on the Front Controls Interface Module (FCIM) are pressed, the FCIM sends a request message to the HVAC module which controls the heated seats by supplying a momentary ground to the heated seat module. If not equipped with navigation, the HVAC module controls the heated seats by supplying a momentary ground to the heated seat module when a heated seat button on the HVAC is pressed.
Upon receiving the request, the heated seat module supplies voltage to the appropriate driver and/or passenger seat cushion and backrest heater mats, which are connected in series. The driver and passenger heater mats share a common ground circuit. Temperature is maintained by the heated seat module using a sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor and monitors the return signal from the temperature sensor for controlling current flow to the heater mats. The heated seat module remains on, heating the seat and maintaining temperature until commanded off from the HVAC module (or until the ignition is turned OFF).
- DTC B1032:11 (Right Front Seat Heater: Circuit Short To Ground) - If the passenger seat request circuit from the HVAC module to the heated seat module is shorted to ground, the DTC is set.
- DTC B1032:12 (Right Front Seat Heater: Circuit Short To Battery) - If the passenger seat request circuit from the HVAC module to the heated seat module is shorted to voltage, the DTC is set.
- DTC B1032:13 (Right Front Seat Heater: Circuit Open) - If the passenger seat request circuit from the HVAC module to the heated seat module is open, the DTC is set.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Backrest or cushion heater mat
- Heated seat module
- HVAC module
- FCIM (if equipped with navigation)
PINPOINT TEST O: THE HEATED SEAT IS INOPERATIVE - FRONT PASSENGER
NOTE: If a seat equipped with a seat mounted side air bag is being repaired, the Supplemental Restraint System (SRS) must be depowered. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.
NOTE: The 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
- Start the engine.
- Verify the driver heated seat is operational.
- Is the driver heated seat operational?
Yes
If equipped with navigation, GO to O2.
If not equipped with navigation, GO to O4.
No
GO to Pinpoint Test M. Pinpoint Test M: The Heated Seats are Inoperative - Both Front Seats
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O2 CHECK FOR FCIM DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Retrieve and record all FCIM DTCs.
- Are any DTCs retrieved?
Yes
REFER to the DTC Chart in Information and Entertainment Systems Testing and Inspection.
No
GO to O3.
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O3 MONITOR FCIM PASSENGER HEATED SEAT (CC_SW_P_HSEATS) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM.
- Monitor the FCIM CC_SW_P_HSEATS PID while pressing the passenger heated seat button.
- Does the PID status agree with the button setting?
Yes
GO to O4.
No
INSTALL a new FCIM. REFER to Information and Entertainment Systems Front Controls Interface Module (FCIM). TEST the system for normal operation.
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O4 CHECK FOR HVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC module.
- Retrieve and record all HVAC DTCs.
- Are any HVAC module DTCs retrieved?
Yes
If DTC B1032:12, GO to O19.
If DTC B1032:13, GO to O20.
If DTC B1032:11, GO to O21.
For all other HVAC module DTCs, REFER to Climate Control System - General Information and Diagnostics Testing and Inspection.
No
If equipped with navigation, GO to O5.
If not equipped with navigation, GO to O6.
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O5 CHECK THE OTHER 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.
- Operate the other HVAC systems (rear defrost, blower fan, temperature control, etc.) and verify the operation.
- Do the other HVAC systems function correctly?
Yes
GO to O7.
No
REFER to Climate Control System - General Information and Diagnostics Testing and Inspection to diagnose the HVAC module.
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O6 MONITOR HVAC MODULE RIGHT SEAT HEATER (ST_HEAT_RT) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - HVAC module.
- NOTE: The PID data will quickly flicker on and off. Watch closely when pressing the switch button.
- Monitor HVAC module ST_HEAT_RT PID while pressing passenger heated seat button.
- Does the PID status agree with the button setting?
Yes
GO to O7.
No
INSTALL a new HVAC module. REFER to Climate Control Service and Repair. TEST the system for normal operation.
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O7 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Seat Side Air Bag Module C339.
- 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. Refer to Battery, Mounting and Cables Battery Disconnect.
- 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 O8.
No
VERIFY Battery Junction Box (BJB) fuse 69 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O8 CHECK RESISTANCE OF THE PASSENGER SEAT HEATER MATS AND HEATER CIRCUITS
- Measure the resistance between heated seat module C359B-6, circuit CHS07 (GY/BU), harness side and ground.
- Is the resistance between 2 and 4 ohms?
Yes
GO to O14.
No
GO to O9.
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O9 CHECK THE PASSENGER SEAT CUSHION HEATER CIRCUIT FOR AN OPEN OR 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 0.5 ohms between C359B-6 and C334-1 and greater than 10,000 ohms between C359B-6 and ground?
Yes
GO to O10.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O10 CHECK THE 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 1.6 and 2.0 ohms?
Yes
GO to O11.
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 side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O11 CHECK FOR AN OPEN BETWEEN THE CUSHION AND BACKREST HEATER MATS
- 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 0.5 ohm?
Yes
GO to O12.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O12 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 0.9 and 1.1 ohm?
Yes
GO to O13.
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 side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O13 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between passenger seat backrest heater C335-2, circuit GD904 (BK/BU), harness side and ground.
- Is the resistance less than 0.5 ohms?
Yes
The fault is intermittent. CHECK the electrical connectors for corrosion, poor pin contact or pushed out pins, particularly the pins and terminals of electrical connectors that were disconnected. Do not install any new components at this time. Components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent wiring, terminal or connector concerns found. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O14 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Heated Seat Module C359A.
- Ignition ON.
- Measure the voltage between heated seat module C359A-9, circuit VHS27 (VT), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. GO to O18 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 Heater Mat - Front Seat Cushion Heater Mat - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to O15.
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O15 CHECK THE TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between heated seat module C359A-9, circuit VHS27 (WH/OG), and C359A-12, circuit RHS05 (YE-VT), harness side.
- Is the resistance between 300 and 300K ohms?
Yes
GO to O19.
No
GO to O16.
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O16 CHECK TEMPERATURE SENSOR CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Passenger Seat Cushion Heater Mat C334.
- 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 O17.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O17 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 O18.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O18 CHECK HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN
- Measure the resistance between heated seat cushion C334 pins 2 and 3, component side.
- Is the resistance between 300 ohms and 300K ohms?
Yes
GO to O19.
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 seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O19 CHECK THE HEATED SEAT MODULE SWITCH REQUEST CIRCUIT FOR A SHORT TO VOLTAGE
- If heated seat module C359A has not been previously disconnected, carry out the following steps:
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag Module C3051.
- Disconnect: Passenger Seat Side Air Bag Module C339.
- Disconnect: Heated Seat Module C359A.
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 Battery, Mounting and Cables Battery Disconnect.
- Disconnect: HVAC Module C2109A (without navigation) or C228B (with navigation).
- 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. CLEAR the DTCs. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to O20.
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O20 CHECK THE HEATED SEAT MODULE SWITCH REQUEST CIRCUIT FOR AN OPEN
- If heated seat module C359A has not been previously disconnected, carry out the following steps:
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag Module C3051
- Disconnect: Passenger Seat Side Air Bag Module C339
- Disconnect: Heated Seat Module C359A
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 Battery, Mounting and Cables Battery Disconnect.
- Disconnect: HVAC Module C2109A (without navigation) or C228B (with navigation) (if not previously disconnected).
- Ignition OFF.
- For vehicles with navigation, 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.
- For vehicles without navigation, measure the resistance between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and HVAC module C2109A-17, circuit CHS30 (GY/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to O21.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O21 CHECK THE HEATED SEAT MODULE SWITCH REQUEST CIRCUIT FOR A SHORT TO GROUND
- If heated seat module C359A has not been previously disconnected, carry out the following steps:
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag Module C3051.
- Disconnect: Passenger Seat Side Air Bag Module C339.
- Disconnect: Heated Seat Module C359A.
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 Battery, Mounting and Cables Battery Disconnect.
- Disconnect: HVAC Module C2109A (without navigation) or C228B (with navigation) (if not previously disconnected).
- 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 O22.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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O22 CHECK THE HVAC MODULE OUTPUT
NOTICE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
- Connect: HVAC Module C2109A (without navigation) or C228B (with navigation).
- Connect: Heated Seat Module C359A and C359B.
- Ignition ON.
- NOTE: The following measurement must be taken by back-probing heated seat module C359A.
- NOTE: Voltage on circuit CHS30 (GY/YE) should drop momentarily when the passenger heated seat button is pressed.
- Measure and record the voltage between heated seat module C359A-8, circuit CHS30 (GY/YE), harness side and ground by back-probing heated seat module connector.
- Measure and record the voltage as directed above while pressing the passenger heated seat button.
- Is the voltage greater than 10 volts before pressing the passenger heated seat button, then momentarily drops when the heated seat 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 side air bag module C339. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
If the voltage is greater than 10 volts but does not drop when the passenger heated seat button is pressed, INSTALL a new HVAC module. REFER to Climate Control Service and Repair. TEST the system for normal operation.
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 side air bag module C339.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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