Pinpoint Test J: The A/C Switch Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test J: The A/C Switch Illumination Is Inoperative

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

Normal Operation

A variable Pulse Width Modulated (PWM) voltage is supplied to the A/C switch from the instrument panel dimmer switch (part of the headlamp switch) when the side, main or parking lamps are on.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- A/C switch



PINPOINT TEST J: THE A/C 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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J1 CHECK THE A/C SWITCH ILLUMINATION VOLTAGE CIRCUIT FOR AN OPEN


- Ignition OFF.
- Disconnect: A/C Switch C2891.
- With the parking lamps on, rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the A/C switch C2891-3, circuit 29S-LH53 (OG/BK), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new A/C switch. TEST the system for normal operation.

No
REPAIR circuit 29S-LH53 (OG/BK) for an open. TEST the system for normal operation.

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