Pinpoint Test E: A Single Illumination Source Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test E: A Single Illumination Source Is Inoperative

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

Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 119, Climate Controlled Seats 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 dimmable switches and components through circuit 484 (OG/BK). The non-dimmable switches and components receive voltage through circuit 964 (DB/LG) from the Central Junction Box (CJB) when the ignition switch is in the ACC or RUN position. The switches and components are grounded through circuits 57 (BK) and 676 (PK/OG).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Illumination source



PINPOINT TEST E: A SINGLE ILLUMINATION SOURCE 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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E1 CHECK FOR VOLTAGE TO THE INOPERATIVE ILLUMINATION SOURCE


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





- Is the voltage greater than 10 volts?

Yes
GO to E2.

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

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E2 CHECK FOR GROUND TO THE INOPERATIVE LAMP(S)


- Ignition OFF.
- Place the headlamp switch in the OFF position.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the inoperative illumination source and ground as follows:





- Is the resistance less than 5 ohms?

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

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

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