Pinpoint Test N: The Heated Seat is Inoperative/Does Not Operate Correctly - Driver
Seats
Pinpoint Tests
Pinpoint Test N: The Heated Seat is Inoperative/Does Not Operate Correctly - Driver
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, battery voltage and ground. The HVAC module supplies a momentary ground signal to the heated seat module to request the system ON or OFF. The heated seat module supplies voltage and ground. The cushion and backrest heater mats are connected in series and operate together. The heated seat module supplies a reference voltage and return to the temperature sensor.
The Front Controls Interface Module (FCIM) and the HVAC module communicate on the Controller Area Network (CAN).
The heated seat module faults are only be detected when the module is operating in the LOW or HIGH state. If a fault is detected by the heated seat module, the module stops supplying power to that individual left or right seat as well as the switch indicator on which that fault was detected. Reset the module by cycling the ignition OFF and ON. The heated seat module does not report DTCs and does not communicate on the CAN.
The heated seat module faults detected are:
- a heater feed circuit short to battery, ground or open.
- a sensor circuit short to battery or open.
- a heated seat switch stuck closed to ground.
The HVAC module reports the following DTCs for the driver heated seat. These DTCs are for request circuit CHS29.
- DTC B1030:11 (Left Front Seat Heater: Circuit Short To Ground) - If the driver seat request circuit from the HVAC module to the heated seat module is shorted to ground, the DTC is set.
- 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 B1030:13 (Left Front Seat Heater: Circuit Open) - If the driver 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(s)
- Wiring, terminals or connectors
- Heater mat
- Heated seat module
- HVAC module
- FCIM
PINPOINT TEST N: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - 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.
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N1 CHECK HEATED SEAT INDICATOR ILLUMINATION
- Ignition OFF.
- Start the engine.
- Verify system indicator illumination.
- Do the driver heated seat indicators illuminate or flash and then turn off?
Yes
GO to N7.
No
GO to N2.
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N2 CHECK THE FCIM FOR DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any DTCs retrieved?
Yes
REFER to the DTC Chart in Information and Entertainment Systems Testing and Inspection.
No
GO to N3.
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N3 CHECK THE HVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Are any DTCs retrieved?
Yes
If DTC B1030:12, GO to N18.
If DTC B1030:11, GO to N19.
If DTC B1030:13, GO to N20.
For any other HVAC module DTCs, REFER to the HVAC Module DTC Chart. HVAC Module DTC Chart
No
For vehicles without navigation, GO to N4.
For vehicles with navigation, GO to N5.
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N4 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. REFER to Information and Entertainment Systems Front Controls Interface Module (FCIM). TEST the system for normal operation.
No
REFER to Climate Control System - General Information and Diagnostics Testing and Inspection, to diagnose the HVAC concern.
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N5 MONITOR THE FCIM PIDs AND CHECK INPUTS
- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs.
- Driver Heated Seat (CC_SW_D_HSEATS)
- Monitor the FCIM PIDs while pushing the driver heated seat button.
- Do the PID values agree with the switch button positions?
Yes
GO to N6.
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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N6 MONITOR THE HVAC MODULE PIDs AND CHECK INPUTS
- Enter the following diagnostic mode on the scan tool: DataLogger - HVAC Module - PIDs.
- Left Seat Heater (ST_HEAT_LT)
- NOTE: The PID data will quickly flicker on and off. Watch closely when pressing the FCIM buttons.
- Monitor HVAC module PIDs while pushing the driver 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. CLEAR the DTCs. REPEAT the self-test. CHECK the system for normal operation.
No
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (HVAC) Module. TEST the system for normal operation.
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N7 CHECK THE VOLTAGE TO THE HEATED SEAT MODULE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Side Air Bag C3138.
- Disconnect: Driver Safety Belt Buckle Pretensioner C3065.
- Disconnect: Passenger Seat Side Air Bag Module 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. Refer to Battery, Mounting and Cables Battery Disconnect.
- Ignition ON.
- Measure the voltage between:
- heated seat module C359B-1, circuit CBX01 (GN/RD), harness side and ground.
- heated seat module C359B-2, circuit SBX06 (GY/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to N8.
No
VERIFY Smart Junction Box (SJB) fuses 18 (20A) and 35 (10A) are OK. If OK, REPAIR the affected 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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N8 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between heated seat module C359B-5, circuit GD903 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to N9.
No
REPAIR the circuit. 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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N9 CHECK HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Heated Seat Module C359A.
- Disconnect: Driver Seat Cushion Heater Mat C364.
- Ignition ON.
- Measure the voltage between heated seat module C359A-3, circuit VHS26 (VT), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. GO to N12 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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to N10.
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N10 CHECK TEMPERATURE SENSOR CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between:
- heated seat module C359A-3, circuit VHS26 (VT), harness side and seat cushion heater mat C364-2, circuit VHS26 (VT), harness side.
- heated seat module C359A-3, circuit VHS26 (VT), harness side and ground.
- Is the resistance less than 5 ohms between C359A-3 and C364-2, and greater than 10,000 ohms between C359A-3 and ground?
Yes
GO to N11.
No
REPAIR the circuit. 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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N11 CHECK TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between heated seat module C359A-12, circuit RHS05 (YE/VT), harness side and driver seat cushion heater mat C364-3, circuit RHS05 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to N12.
No
REPAIR the circuit. 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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N12 CHECK HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN
- Measure the resistance between heated seat cushion C364 pin 2 and pin 3 component side.
- Is the resistance between 300 ohms and 300,000 ohms?
Yes
GO to N13.
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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N13 CHECK DRIVER SEAT HEATER MAT CIRCUIT
- Connect: Driver Seat Cushion Heater Mat C364.
- Measure the resistance between heated seat module C359B-4, circuit CHS02 (YE/BU), harness side and ground.
- Is the resistance between 1.2 and 4 ohms?
Yes
GO to N21.
No
GO to N14.
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N14 CHECK CUSHION HEATER MAT CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Disconnect: Driver Seat Cushion Heater Mat C364.
- Measure the resistance between:
- heated seat module C359B-4, circuit CHS02 (YE/BU), harness side and cushion heater mat C364-1, circuit CHS02 (YE/BU), harness side.
- heated seat module C359B-4, circuit CHS02 (YE/BU), harness side and ground.
- Is the resistance less than 5 ohms between C359B-4 and C364-1, and greater than 10,000 ohms between C359B-4 and ground?
Yes
GO to N15.
No
REPAIR the circuit. 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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N15 CHECK DRIVER SEAT CUSHION HEATER MAT FOR AN OPEN
- Measure the resistance between driver seat cushion heater mat C364 pins 1 and 4, component side.
- Is the resistance between 0.6 and 2 ohms?
Yes
GO to N16.
No
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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N16 CHECK CUSHION HEATER MAT CIRCUIT FOR AN OPEN
- Disconnect: Driver Seat Backrest Heater Mat C365.
- Measure the resistance between seat cushion heater mat C364-4, circuit CHS01 (GY/VT), harness side and seat backrest heater mat C365-1, circuit CHS01 (GY/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to N17.
No
REPAIR the circuit. 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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N17 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 ohms?
Yes
REPAIR circuit GD904 (BK/BU). 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.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
INSTALL a new driver 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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N18 CHECK THE HEATED SEAT MODULE COMMAND CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- 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. Refer to Battery, Mounting and Cables Battery Disconnect.
- Ignition ON.
- Measure the voltage between heated seat module C359A-2, circuit CHS29 (WH/BU), 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N19 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- 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. Refer to Battery, Mounting and Cables Battery Disconnect.
- Measure the resistance between heated seat module C359A-2, circuit CHS29 (WH/BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (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 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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N20 CHECK HEATED SEAT MODULE COMMAND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- 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. Refer to Battery, Mounting and Cables Battery Disconnect.
- Measure the resistance between heated seat module C359A-2, circuit CHS29 (WH/BU), harness side and HVAC module C228A-9, circuit CHS29 (WH/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (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 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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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N21 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 CHS29 (WH/BU) should drop momentarily when the driver heated seat control button is pressed.
- Measure the voltage between heated seat module C359A-2, circuit CHS29 (WH/BU), harness side and ground by back-probing heated seat module C359A-2. Press the driver heated seat control button 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?
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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
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 did not drop when the driver heated seat button was pressed, INSTALL a new HVAC module. REFER to Climate Control Heating Ventilation Air Conditioning (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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3137.
CONNECT driver safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag module C3138.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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