Pinpoint Test F: One Or More Switch Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test F: One Or More Switch Illumination is Inoperative

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

Normal Operation - Dimmable Backlighting

When the parking lamps are on, the Smart Junction Box (SJB) sends a Pulse Width Modulated (PWM) voltage to the dimmable components.

Fixed Backlighting

When the accessory delay relay is energized, voltage is supplied to the door lock control switches.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Audio Control Module (ACM) (vehicles without navigation)
- Headlamp switch
- Climate control assembly
- Traction control switch
- Upfitter switches
- Door lock control switch



PINPOINT TEST F: ONE OR MORE SWITCH 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.

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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.
- Ignition ON.
- For dimmable components, place the headlamp switch in the PARKING LAMPS ON position and rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the inoperative illuminated component, harness side and ground as follows:









- Is the voltage greater than 10 volts?

Yes
For the LH or RH front door lock control switch, INSTALL a new door lock control switch. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.

For all others, GO to F2.

No
REPAIR the circuit in question for an open. TEST the system for normal operation.

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


- Measure the voltage between the inoperative illuminated component, harness side as follows:









- Is the voltage greater than 10 volts?

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

No
REPAIR the ground circuit for an open. TEST the system for normal operation.

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