Pinpoint Test U: The Heated Seat Does Not Operate Correctly - Left Rear Seat Does Heat But the Heated Seat Indicator Does Not I
Seats
Pinpoint Tests
Pinpoint Test U: The Heated Seat Does Not Operate Correctly - Left Rear Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
Pressing the left rear heated seat switch once in either the high or low mode will activate the left rear heated seat. Voltage is then supplied from the heated seat module to the appropriate switch indicator circuit CHS48 (YE) (high heat mode) or CHS49 (VT) (low heat mode) to illuminate the switch indicator. Pressing the switch button again (in the same mode) will deactivate the seat and indicator.
A new heated seat module must be configured after installation for correct operation. To configure, press the low heat mode button on either rear heated seat switch. Module configuration will occur automatically after the low heat mode button is pressed. Until the module is correctly configured, the heated seats will operate incorrectly when selecting the high heat mode by following a sequence of high, low and off with each button press. The system will operate correctly after the heated seat module receives a low heat request on either of the low heat request circuits and heated seat module configuration is activated.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat switch
- Heated seat module
PINPOINT TEST U: THE HEATED SEAT DOES NOT OPERATE CORRECTLY - LEFT REAR SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED
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U1 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND
- Disconnect: Left Rear Heated Seat Switch C3181.
- Disconnect: Heated Seat Module C3054A.
- Measure the resistance between:
- heated seat module C3054A-4, circuit CHS49 (VT), harness side and ground.
- heated seat module C3054A-5, circuit CHS48 (YE), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to U2.
No
REPAIR the circuit(s). TEST the system for normal operation.
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U2 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN
- Measure the resistance between:
- heated seat module C3054A-4, circuit CHS49 (VT), harness side and left rear heated seat switch C3181-3, circuit CHS49 (VT), harness side.
- heated seat module C3054A-5, circuit CHS48 (YE), harness side and left rear heated seat switch C3181-4, circuit CHS48 (YE), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to U3.
No
REPAIR the circuit(s). TEST the system for normal operation.
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U3 CHECK THE HEATED SEAT HIGH INDICATOR
- Connect: Left Rear Heated Seat Switch C3181.
- Disconnect: Heated Seat Module C3054B.
- Ignition ON.
- Connect a fused jumper lead between heated seat module C3054A-5, circuit CHS48 (YE), harness side and C3054B-1, circuit SBP18 (YE/RD), harness side.
- Does the high indicator illuminate?
Yes
GO to U4.
No
INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Second Row Heated Seat Switch - Second Row. TEST the system for normal operation.
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U4 CHECK THE HEATED SEAT LOW INDICATOR
- Connect a fused jumper lead between heated seat module C3054A-4, circuit CHS49 (VT), harness side and C3054B-1, circuit SBP18 (YE/RD), harness side.
- Does the low indicator illuminate?
Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Second Row Heated Seat Module - Second Row. TEST the system for normal operation.
No
INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Second Row Heated Seat Switch - Second Row. TEST the system for normal operation.
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