Pinpoint Test F: The Individual Hardwired Component Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test F: The Individual Hardwired Component Illumination is Inoperative

Refer to Wiring Diagram Set 71, Cluster and Panel Illumination for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) sends a Pulse Width Modulated (PWM) voltage to the dimmable components through circuit VLN04 (VT/GY). Ground is provided through circuits GD114 (BK/BU), GD116 (BK/VT) and GD149 (BK/GY).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Ambient lighting switch (if equipped)
- Clock (if equipped)
- Center stack switch assembly
- Floor shifter
- Headlamp switch
- Message center switch
- Power liftgate switch (if equipped)
- Liftgate release switch
- Auxiliary climate control switches (if equipped)



PINPOINT TEST F: THE INDIVIDUAL HARDWIRED COMPONENT ILLUMINATION IS INOPERATIVE

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 VOLTAGE TO THE SINGLE ILLUMINATION SOURCE


NOTE: If the headlamp switch illumination is the inoperative source, unplug the headlamp switch connector to measure the illumination circuit voltage. Unplugging the connector causes the SJB to turn the exterior lights on by default for 10 minutes, so it is unnecessary to turn on the headlamp switch.

- Ignition OFF.
- Disconnect: Inoperative Illumination Source.
- Place the headlamp switch to the PARKING LAMPS ON position.
- Rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the inoperative illumination source, harness side and ground as follows:





- Is the voltage greater than 10 volts?

Yes
TURN the headlamp switch off. GO to F2.

No
REPAIR the circuit. TEST the system for normal operation.

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F2 CHECK THE GROUND CIRCUIT TO THE SINGLE ILLUMINATION SOURCE FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the inoperative illumination source, harness side and ground as follows:





- Is the resistance less than 5 ohms?

Yes
INSTALL a new component in question. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

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