Pinpoint Test W: The Heated Seat is Inoperative/Does Not Operate Correctly - Left Rear
Seats
Pinpoint Tests
Pinpoint Test W: The Heated Seat is Inoperative/Does Not Operate Correctly - Left 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 left rear heated seat control switch is pressed with the ignition switch in RUN or START, a ground is supplied on circuit CHS46 (YE/GN) to command the system ON or OFF in hi heat mode or circuit CHS47 (VT/GN) 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 CHS48 (YE) (hi heat mode) or circuit CHS49 (VT) (low heat mode) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit CHS39 (GN/BU) and ground to the heater mats on circuit GD126 (BK/WH). 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 VHS42 (GN) 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 W: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - LEFT 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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W1 CHECK CIRCUIT SBB07 (WH/RD) FOR VOLTAGE TO THE HEATED SEAT MODULE
- Disconnect: Heated Seat Module C3162.
- Measure the voltage between heated seat module C3162-1, circuit SBB07 (WH/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to W2.
No
REPAIR the circuit. TEST the system for normal operation.
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W2 CHECK CIRCUIT CHS39 (GN/BU) FOR AN OPEN AND A SHORT TO GROUND
- Disconnect: Left Rear Cushion Heater Mat C3167.
- Measure the resistance between:
- left rear seat cushion heater mat C3167-1, circuit CHS39 (GN/BU), harness side and ground.
- left rear seat cushion heater mat C3167-1, circuit CHS39 (GN/BU), harness side and heated seat module C3162-9, circuit CHS39 (GN/BU), harness side.
- Is the resistance greater than 10,000 ohms between the left rear seat cushion heater mat and ground; and less than 5 ohms between the left rear seat cushion heater mat and the heated seat module?
Yes
GO to W3.
No
REPAIR the circuit. TEST the system for normal operation.
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W3 CHECK CIRCUIT VHS42 (GN) FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- left rear seat cushion heater mat C3167-2, circuit VHS42 (GN), harness side and ground.
- left rear seat cushion heater mat C3167-2, circuit VHS42 (GN), harness side and heated seat module C3162-10, circuit VHS42 (GN), harness side.
- Is the resistance greater than 10,000 ohms between the left rear seat cushion heater mat and ground and less than 5 ohms between the left rear seat cushion heater mat and the heated seat module?
Yes
GO to W4.
No
REPAIR the circuit. TEST the system for normal operation.
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W4 CHECK CIRCUIT RHS41 (GN/BN) FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- left rear seat cushion heater mat C3167-3, circuit RHS41 (GN/BN), harness side and ground.
- left rear seat cushion heater mat C3167-3, 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 left rear seat cushion heater mat and ground and less than 5 ohms between the left rear seat cushion heater mat and the heated seat module?
Yes
GO to W5.
No
REPAIR the circuit. TEST the system for normal operation.
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W5 CHECK CIRCUITS CHS39 (GN/BU), VHS42 (GN) AND RHS41 (GN/BN) FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the following left rear seat cushion heater mat C3167 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 W6.
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W6 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between left rear seat cushion heater mat C3167-4, circuit GD126 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to W7.
No
REPAIR the circuit. TEST the system for normal operation.
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W7 CHECK CUSHION AND BACKREST HEATER MAT AND SENSOR FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between:
- left rear seat cushion heater mat C3167 pin 1, component side and ground.
- left rear seat cushion heater mat C3167 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 W8.
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W8 CHECK CUSHION HEATED SEAT MAT FOR AN OPEN AND A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Left Rear Seat Cushion Heater Mat to Left Rear Seat Backrest Heater Mat Connector.
- Measure the resistance between:
- left rear seat cushion heater mat C3167 pin 1, component side and ground.
- left rear seat cushion heater mat C3167 pin 1, component side and left rear seat cushion heater mat to left rear seat backrest heater mat connector pin 1, cushion side.
- Is the resistance greater than 10,000 ohms between the left rear seat cushion heater mat and ground; and between 1.2 and 2.2 ohms between the left rear seat cushion heater mat and left rear seat backrest heater mat?
Yes
GO to W9.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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W9 CHECK BACKREST HEATED SEAT MAT FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- left rear seat backrest heater mat connector pin 2, component side and ground.
- left rear seat backrest heater mat connector pin 1 and pin 2, component side.
- Is the resistance greater than 10,000 ohms between the left rear seat backrest heater mat and ground; and between 1.2 and 2.2 ohms between the left rear seat backrest heater mat pins?
Yes
GO to W10.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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W10 CHECK CIRCUIT BETWEEN BACKREST AND CUSHION HEATER MAT
- Measure the resistance between left rear seat cushion heater mat C3167 pin 4, component side and left rear seat cushion heater mat to left rear seat backrest heater mat connector pin 2, cushion side.
- Is the resistance less than 5 ohms?
Yes
GO to W11.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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W11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN AND A SHORT TO GROUND
- Measure the resistance between:
- left rear seat cushion heater mat C3167 pin 2 and pin 3, component side.
- left rear seat cushion heater mat C3167 pin 2, component side and ground.
- Is the resistance less than 170,000 ohms and greater than 725 ohms between left rear seat cushion heater mat pins; and greater than 10,000 ohms between left rear seat cushion heater mat and ground?
Yes
GO to W12.
No
INSTALL a new cushion heater mat. TEST the system for normal operation.
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W12 CHECK CIRCUITS CHS46 (YE/GN) AND CHS47 (VT/GN) FOR A SHORT TO VOLTAGE
- Disconnect: Left Rear Heated Seat Switch C722.
- Ignition ON.
- Measure the voltage between:
- heated seat module C3162-11, circuit CHS46 (YE/GN), harness side and ground.
- heated seat module C3162-12, circuit CHS47 (VT/GN), harness side and ground.
- Is voltage present on either circuit?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to W13.
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W13 CHECK CIRCUITS CHS46 (YE/GN) AND CHS47 (VT/GN) FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between:
- heated seat module C3162-11, circuit CHS46 (YE/GN), harness side and ground.
- heated seat module C3162-12, circuit CHS47 (VT/GN), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to W14.
No
REPAIR the circuit. TEST the system for normal operation.
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W14 CHECK BETWEEN CIRCUITS CHS46 (YE/GN) AND CHS47 (VT/GN) FOR A SHORT
- Measure the resistance between heated seat module C3162-11, circuit CHS46 (YE/GN), harness side and heated seat module C3162-12, circuit CHS47 (VT/GN), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to W15.
No
REPAIR the circuits. TEST the system for normal operation.
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W15 CHECK CIRCUITS CHS46 (YE/GN) AND CHS47 (VT/GN) FOR AN OPEN
- Measure the resistance between:
- heated seat module C3162-11, circuit CHS46 (YE/GN), harness side and left rear heated seat switch C722-6, circuit CHS46 (YE/GN), harness side.
- heated seat module C3162-12, circuit CHS47 (VT/GN), harness side and left rear heated seat switch C722-2, circuit CHS47 (VT/GN), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to W16.
No
REPAIR the circuit. TEST the system for normal operation.
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W16 CHECK HEATED SEAT SWITCH GROUND CIRCUIT GD126 (BK/WH)
- Measure the resistance between left rear heated seat switch C722-1, circuit GD126 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to W17.
No
REPAIR the circuit. TEST the system for normal operation.
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W17 CHECK THE RIGHT REAR HEATED SEAT SWITCH
- Connect the right rear heated seat switch to the left rear heated seat switch connector.
- Ignition ON.
- Check the left rear heated seat operation.
- Does the left 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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