Pinpoint Test F: The Instrument Panel Illumination Does Not Dim
Instrument Cluster and Panel Illumination
Pinpoint Test F: The Instrument Panel Illumination Does Not Dim
Refer to Wiring Diagram Set 71, Cluster and Panel Illumination for schematic and connector information. Diagrams By Number
Normal Operation
The Lighting Control Module (LCM) supplies a variable Pulse Width Modulated (PWM) voltage to the instrument panel switches through circuit 484 (OG/BK). The LCM uses the instrument panel dimmer switch to determine the intensity of switch illumination.
- DTC B2212 (Panel Dim Switch Out Of Range) - an on-demand DTC that sets when the LCM detects an out of range condition on the dimmer switch input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Instrument panel dimmer switch
- LCM
PINPOINT TEST F: THE INSTRUMENT PANEL ILLUMINATION DOES NOT DIM
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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F1 CHECK THE DTCs FROM THE LCM SELF-TEST
- Check the recorded results from the LCM self-test.
- Is DTC B2212 recorded?
Yes
GO to F2.
No
GO to F6.
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F2 CHECK CIRCUIT 1036 (BN/WH) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: LCM C2145a.
- Ignition ON.
- Measure the voltage between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
No
GO to F3.
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F3 CHECK CIRCUIT 1036 (BN/WH) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C205b.
- Measure the resistance between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and the instrument panel dimmer switch C205b-6, circuit 1036 (BN/WH), harness side; and between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and ground.
- Is the resistance less than 5 ohms between the LCM and the instrument panel dimmer switch, and greater than 10,000 ohms between the LCM and ground?
Yes
GO to F4.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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F4 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the instrument panel dimmer switch C205b-4, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to F5.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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F5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Carry out the component tests for the instrument panel dimmer switch.
- Does the instrument panel dimmer switch pass the component tests?
Yes
GO to F7.
No
INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
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F6 CHECK CIRCUIT 484 (OG/BK) FOR SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: LCM C2145c.
- Ignition ON.
- Measure the voltage between the LCM C2145c-3, circuit 484 (OG/BK), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to F7.
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F7 CHECK FOR CORRECT LCM OPERATION
- Ignition OFF.
- Disconnect all the LCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the LCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern is still present?
Yes
INSTALL a new LCM. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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