Pinpoint Test R: the Heated Seat Is Inoperative - Left Rear, Does Not Operate In Low
Seats
Pinpoint Tests
Pinpoint Test R: The Heated Seat is Inoperative - Left Rear, Does Not Operate in Low
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The left rear heated seat module receives voltage feed on circuit 1445 (RD/LG), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1255 (WH/RD) to command the system ON or OFF (LOW heat mode).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat switch
- Heated seat module
PINPOINT TEST R: THE HEATED SEAT IS INOPERATIVE - LEFT REAR, DOES NOT OPERATE IN LOW
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R1 CHECK THE HEATED SEAT SWITCH INPUT RESISTANCE TO THE HEATED SEAT MODULE
- Ignition OFF.
- Disconnect: Left Rear Heated Seat Module C3162.
- Measure the resistance between left rear heated seat module C3162-11, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
- Is the resistance less than 75 ohms while pressing the heated seat switch?
Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Rear Seat Heated Seat Module - Rear Seat. TEST the system for normal operation.
No
GO to R2.
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R2 CHECK CIRCUIT 1255 (WH/RD) FOR AN OPEN OR SHORT TO GROUND
- Disconnect: Left Rear Heated Seat Switch C722.
- Measure the resistance between:
- left rear heated seat switch C722-2, circuit 1255 (WH/RD), harness side and left rear heated seat module C3162-11, circuit 1255 (WH/RD), harness side.
- left rear heated seat switch C722-2, circuit 1255 (WH/RD), harness side and ground.
- Is the resistance less than 5 ohms between the heated seat switch and heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
Yes
GO to R3.
No
REPAIR the circuit. TEST the system for normal operation.
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R3 CHECK CIRCUIT 1255 (WH/RD) FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between left rear heated seat module C3162-11, circuit 1255 (WH/RD), harness side and ground.
- Is any voltage present?
Yes
INSTALL a new heated seat switch. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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