Pinpoint Test V: The Heated Seat Is Inoperative/Does Not Operate Correctly - Right Rear
Seats
Pinpoint Tests
Pinpoint Test V: 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 SBB05 (GY/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 high 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) (high 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 GD148 (BK/YE). 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
- Heated seat switch
- Heater mat
- Heated seat module
PINPOINT TEST V: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - RIGHT REAR
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V1 CHECK THE REAR HEATED SEAT CIRCUIT FOR VOLTAGE
- Disconnect: Heated Seat Module C3162.
- Measure the voltage between heated seat module C3162-17, circuit SBB05 (GY/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to V2.
No
REPAIR the circuit. TEST the system for normal operation.
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V2 CHECK THE RIGHT REAR HEATED SEAT FEED CIRCUIT 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 heated seat module C3162-8, circuit CHS43 (GY/BU), harness side.
- right rear seat cushion heater mat C3169-1, circuit CHS43 (GY/BU), harness side and ground.
- Is the resistance less than 5 ohms between C3162-8 and C3169-1 and greater than 10,000 ohms between C3169-1 and ground;?
Yes
GO to V3.
No
REPAIR the circuit. TEST the system for normal operation.
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V3 CHECK THE RIGHT REAR HEATED SEAT SENSOR CIRCUIT 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 heated seat module C3162-16, circuit VHS45 (GY/BN), harness side.
- right rear seat cushion heater mat C3169-2, circuit VHS45 (GY/BN), harness side and ground.
- Is the resistance less than 5 ohms between C3162-16 and C3169-2 and greater than 10,000 ohms between the C3169-2 and ground;?
Yes
GO to V4.
No
REPAIR the circuit. TEST the system for normal operation.
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V4 CHECK THE HEATED SEAT SENSOR RETURN CIRCUIT 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 heated seat module C3162-13, circuit RHS41 (GN/BN), harness side.
- right rear seat cushion heater mat C3169-3, circuit RHS41 (GN/BN), harness side and ground.
- Is the resistance less than 5 ohms between C3162-13 and C3169-3 and greater than 10,000 ohms between C3169-3 and ground?
Yes
GO to V5.
No
REPAIR the circuit. TEST the system for normal operation.
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V5 CHECK THE RIGHT REAR CUSHION CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between right rear cushion mat C3169, harness side and ground using the following chart:
- Is voltage present on any circuit?
Yes
REPAIR the affected circuit. TEST the system for normal operation.
No
GO to V6.
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V6 CHECK THE BACKREST HEATER MAT GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Right Rear Seat Backrest Heater Mat C3170.
- Measure the resistance between right rear seat cushion backrest heater mat C3170-1, circuit GD148 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to V7.
No
REPAIR the circuit. TEST the system for normal operation.
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V7 CHECK THE CUSHION 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
INSTALL a new cushion heater mat. TEST the system for normal operation.
No
GO to V8.
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V8 CHECK THE CUSHION HEATER MAT FOR AN OPEN AND A SHORT TO GROUND
- Ignition OFF.
- Measure resistance between:
- right rear seat cushion heater mat C3169 pin 1, component side and ground.
- right rear seat cushion heater mat C3169 pin 1 and pin 4, component side.
- Is resistance greater than 10,000 ohms between the right rear seat cushion heater mat and ground; and between 1.6 and 2.2 ohms between the right rear seat cushion heater mat pins 1 and 4?
Yes
GO to V9.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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V9 CHECK THE BACKREST HEATER 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 2 and pin 1, component side.
- Is resistance greater than 10,000 ohms between the right rear seat backrest heater mat and ground; and between 1.6 and 2.2 ohms between the right rear seat backrest heater mat pins?
Yes
GO to V10.
No
INSTALL a new backrest heater mat. TEST the system for normal operation.
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V10 CHECK THE HEATER MAT CIRCUIT FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- right rear seat cushion heater mat C3169-4, circuit CHS44 (GN/VT), harness side and right rear seat backrest heater mat C3170-2, circuit CHS44 (GN/VT), harness side.
- right rear seat cushion heater mat C3169-4, circuit CHS44 (GN/VT), harness side and ground.
- Is resistance less than 5 ohms?
Yes
GO to V11.
No
REPAIR the circuit. TEST the system for normal operation.
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V11 CHECK THE HEATER MAT TEMPERATURE SENSOR 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 resistance less than 300,000 ohms and greater than 50 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 V12.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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V12 CHECK HEATED SEAT SWITCH CIRCUITS FOR A SHORT TO VOLTAGE
- Disconnect: Right Rear Heated Seat Switch C3341.
- 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 V13.
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V13 CHECK THE HEATED SEAT SWITCH CIRCUITS 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 V14.
No
REPAIR the circuit. TEST the system for normal operation.
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V14 CHECK FOR A SHORT BETWEEN HEATED SEAT SWITCH CIRCUITS
- 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.
- Is the resistance greater than 10,000 ohms?
Yes
GO to V15.
No
REPAIR the circuits. TEST the system for normal operation.
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V15 CHECK THE HEATED SEAT SWITCH CIRCUITS FOR AN OPEN
- Measure the resistance between:
- heated seat module C3162-14, circuit CHS50 (BU/GY), harness side and right rear heated seat switch C3341-2, circuit CHS50 (BU/GY), harness side.
- heated seat module C3162-15, circuit CHS51 (YE/GY), harness side and right rear heated seat switch C3341-6, circuit CHS51 (YE/GY), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to V16.
No
REPAIR the circuit. TEST the system for normal operation.
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V16 CHECK THE HEATED SEAT SWITCH GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between right rear heated seat switch C3341-1, circuit GD133 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to V17.
No
REPAIR the circuit. TEST the system for normal operation.
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V17 CHECK THE REAR HEATED SEAT OPERATION USING ANOTHER 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 Heated Seat Switch - Rear. TEST the system for normal operation.
No
INSTALL a new heated seat module. REFER to Heated Seat Module - Rear Heated Seat Module - Rear. TEST the system for normal operation.
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