Pinpoint Test I: The Air Inlet Mode Switch Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test I: The Air Inlet Mode 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 air inlet mode 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
- Air inlet mode switch


PINPOINT TEST I: THE AIR INLET MODE 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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I1 CHECK THE AIR INLET MODE SWITCH ILLUMINATION VOLTAGE CIRCUIT FOR AN OPEN


- Ignition OFF.
- Disconnect: Air Inlet Mode Switch C2890.
- With the parking lamps on, rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the air inlet mode switch C2890-3, circuit 29S-LH53 (OG/BK), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new air inlet mode 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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