Pinpoint Test X: The Heated Seat is Inoperative/Does Not Operate Correctly - Right Rear
Seats
Pinpoint Tests
Pinpoint Test X: The Heated Seat is Inoperative/Does Not Operate Correctly - Right Rear
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The heated seat module receives battery voltage on circuit CBP35 (YE/GY) and ignition voltage on circuit SBB07 (WH/RD), and is supplied ground on circuit GD133 (BK). When the right rear heated seat control switch is pressed with the ignition switch in RUN or START, a ground is supplied on circuit CHS50 (BU/GY) to command the system ON or OFF in hi heat mode or circuit CHS51 (YE/GY) to command the system ON or OFF in low heat mode. When commanded ON, voltage is supplied to the heated seat switch from the heated seat module on either circuit CHS52 (BU) (hi heat mode) or circuit CHS53 (WH/BN) (low heat mode) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit CHS43 (GY/BU) and ground to the heater mats on circuit GD151 (BK/GN). The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by the heated seat module using a sensor contained within the cushion heater mat. The heated seat module monitors the temperature sensor on circuit VHS45 (GY/BN) for adjusting the current flow to the heater mats and uses a ground supplied on circuit RHS41 (GN/BN). The heated seat module is designed to remain ON, heating the seat and maintaining temperature until switched OFF or the ignition voltage is switched OFF.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heater mat
- Heated seat module
- Heated seat switch
PINPOINT TEST X: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - RIGHT REAR
WARNING: Never install heated seat parts not intended for use on this vehicle. Parts released for other model years or vehicle lines are not compatible even if they appear visually and physically similar. Installing incorrect parts will result in heated seat system performance outside design specification. Failure to follow this instruction may result in serious personal injury.
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X1 CHECK CIRCUIT SBB07 (WH/RD) FOR VOLTAGE TO THE HEATED SEAT MODULE
- Disconnect: Heated Seat Module C3162.
- Measure the voltage between heated seat module C3162-17, circuit SBB07 (WH/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to X2.
No
REPAIR the circuit. TEST the system for normal operation.
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X2 CHECK CIRCUIT CHS43 (GY/BU) FOR AN OPEN AND A SHORT TO GROUND
- Disconnect: Right Rear Cushion Heater Mat C3169.
- Measure the resistance between:
- right rear seat cushion heater mat C3169-1, circuit CHS43 (GY/BU), harness side and ground.
- right rear seat cushion heater mat C3169-1, circuit CHS43 (GY/BU), harness side and heated seat module C3162-8, circuit CHS43 (GY/BU), harness side.
- Is the resistance greater than 10,000 ohms between the right rear seat cushion heater mat and ground; and less than 5 ohms between the right rear seat cushion heater mat and the heated seat module?
Yes
GO to X3.
No
REPAIR the circuit. TEST the system for normal operation.
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X3 CHECK CIRCUIT VHS45 (GY/BN) FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- right rear seat cushion heater mat C3169-2, circuit VHS45 (GY/BN), harness side and ground.
- right rear seat cushion heater mat C3169-2, circuit VHS45 (GY/BN), harness side and heated seat module C3162-16, circuit VHS45 (GY/BN), harness side.
- Is the resistance greater than 10,000 ohms between the right rear seat cushion heater mat and ground and less than 5 ohms between the right rear seat cushion heater mat and the heated seat module?
Yes
GO to X4.
No
REPAIR the circuit. TEST the system for normal operation.
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X4 CHECK CIRCUIT RHS41 (GN/BN) FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- right rear seat cushion heater mat C3169-3, circuit RHS41 (GN/BN), harness side and ground.
- right rear seat cushion heater mat C3169-3, circuit RHS41 (GN/BN), harness side and heated seat module C3162-13, circuit RHS41 (GN/BN), harness side.
- Is the resistance greater than 10,000 ohms between the right rear seat cushion heater mat and ground and less than 5 ohms between the right rear seat cushion heater mat and the heated seat module?
Yes
GO to X5.
No
REPAIR the circuit. TEST the system for normal operation.
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X5 CHECK CIRCUITS CHS43 (GY/BU), VHS45 (GY/BN) AND RHS41 (GN/BN) FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the following left rear seat cushion heater mat C3169 pins, harness side and ground:
- Is voltage present on any circuits?
Yes
REPAIR the affected circuit. TEST the system for normal operation.
No
GO to X6.
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X6 CHECK CIRCUIT GD151 (BK/GN) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between right rear seat cushion heater mat C3169-4, circuit GD151 (BK/GN), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to X7.
No
REPAIR the circuit. TEST the system for normal operation.
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X7 CHECK CUSHION AND BACKREST HEATER MAT AND SENSOR FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between:
- right rear seat cushion heater mat C3169 pin 1, component side and ground.
- right rear seat cushion heater mat C3169 pin 2, component side and ground.
- Is voltage present on either circuit?
Yes
REPAIR the circuit. INSTALL a new affected cushion or backrest heater mat. TEST the system for normal operation.
No
GO to X8.
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X8 CHECK CUSHION HEATED SEAT MAT FOR AN OPEN AND A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Right Rear Seat Cushion Heater Mat to Right Rear Seat Backrest Heater Mat Connector.
- Measure the resistance between:
- right rear seat cushion heater mat C3169 pin 1, component side and ground.
- right rear seat cushion heater mat C3169 pin 1, component side and right rear seat cushion heater mat to right rear seat backrest heater mat connector pin 1, cushion side.
- Is the resistance greater than 10,000 ohms between the right rear seat cushion heater mat and ground; and between 1.2 and 2.2 ohms between the right rear seat cushion heater mat and right rear seat backrest heater mat?
Yes
GO to X9.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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X9 CHECK BACKREST HEATED SEAT MAT FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- right rear seat backrest heater mat connector pin 2, component side and ground.
- right rear seat backrest heater mat connector pin 1 and pin 2, component side.
- Is the resistance greater than 10,000 ohms between the right rear seat backrest heater mat and ground; and between 1.2 and 2.2 ohms between the right rear seat backrest heater mat pins?
Yes
GO to X10.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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X10 CHECK CIRCUIT BETWEEN BACKREST AND CUSHION HEATER MAT
- Measure the resistance between right rear seat cushion heater mat C3169 pin 4, component side and right rear seat cushion heater mat to right rear seat backrest heater mat connector pin 2, cushion side.
- Is the resistance less than 5 ohms?
Yes
GO to X11.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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X11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- right rear seat cushion heater mat C3169 pin 2 and pin 3, component side.
- right rear seat cushion heater mat C3169 pin 2, component side and ground.
- Is the resistance less than 170,000 ohms and greater than 725 ohms between right rear seat cushion heater mat pins; and greater than 10,000 ohms between right rear seat cushion heater mat and ground?
Yes
GO to X12.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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X12 CHECK CIRCUITS CHS50 (BU/GY) AND CHS51 (YE/GY) FOR A SHORT TO VOLTAGE
- Disconnect: Right Rear Heated Seat Switch C822.
- Ignition ON.
- Measure the voltage between:
- heated seat module C3162-14, circuit CHS50 (BU/GY), harness side and ground.
- heated seat module C3162-15, circuit CHS51 (YE/GY), harness side and ground.
- Is voltage present on either circuit?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to X13.
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X13 CHECK CIRCUITS CHS50 (BU/GY) AND CHS51 (YE/GY) FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between:
- heated seat module C3162-14, circuit CHS50 (BU/GY), harness side and ground.
- heated seat module C3162-15, circuit CHS51 (YE/GY), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to X14.
No
REPAIR the circuit. TEST the system for normal operation.
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X14 CHECK BETWEEN CIRCUITS CHS50 (BU/GY) AND CHS51 (YE/GY) FOR A SHORT
- Measure the resistance between heated seat module C3162-14, circuit CHS50 (BU/GY), harness side and heated seat module C3162-15, circuit CHS51 (YE/GY), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to X15.
No
REPAIR the circuits. TEST the system for normal operation.
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X15 CHECK CIRCUITS CHS50 (BU/GY) AND CHS51 (YE/GY) FOR AN OPEN
- Measure the resistance between:
- heated seat module C3162-14, circuit CHS50 (BU/GY), harness side and right rear heated seat switch C822-6, circuit CHS50 (BU/GY), harness side.
- heated seat module C3162-15, circuit CHS51 (YE/GY), harness side and right rear heated seat switch C822-2, circuit CHS51 (YE/GY), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to X16.
No
REPAIR the circuit. TEST the system for normal operation.
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X16 CHECK HEATED SEAT SWITCH GROUND CIRCUIT GD145 (BK/BU)
- Measure the resistance between right rear heated seat switch C822-1, circuit GD145 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to X17.
No
REPAIR the circuit. TEST the system for normal operation.
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X17 CHECK THE RIGHT REAR HEATED SEAT SWITCH
- Connect the left rear heated seat switch to the right rear heated seat switch connector.
- Ignition ON.
- Check the right rear heated seat operation.
- Does the right rear heated seat operate correctly?
Yes
INSTALL a new heated seat switch. REFER to Heated Seat Switch - Rear Seat Heated Seat Switch - Rear Seat. TEST the system for normal operation.
No
INSTALL a new heated seat module. REFER to Heated Seat Module - Rear Seat Heated Seat Module - Rear Seat. TEST the system for normal operation.
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