Pinpoint Test F: An Individual Demand Lamp Is Inoperative

Interior Lighting


Pinpoint Tests


Pinpoint Test F: An Individual Demand Lamp Is Inoperative

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number

Normal Operation

When the battery saver relay is energized, voltage is supplied to the demand lamps through circuit CLN09 (YE/GN). The demand lamps are provided ground through circuits GD133 (BK) and GD149 (BK/GY).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Sun visor
- Interior lamp
- Body builder equipment



PINPOINT TEST F: AN INDIVIDUAL DEMAND LAMP 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 FOR VOLTAGE TO THE LAMP


- Ignition OFF.
- Disconnect: Inoperative Demand Lamp .
- Ignition ON.
- Measure the voltage between the inoperative demand lamp, harness side and ground as follows:

Vehicles With Rear Headliner:

Vehicles Without Rear Headliner (Except Cutaway):

Cutaway Chassis Vehicles:

- Is the voltage greater than 10 volts?

Yes
For a vanity lamp, INSTALL a new sun visor in question. TEST the system for normal operation.

For the body builder connector, the vehicle is operating correctly. REFER to the body builder information to continue diagnosis.

For all other demand lamps, GO to F2.

No
REPAIR circuit CLN09 (YE/GN) for an open. TEST the system for normal operation.

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F2 CHECK FOR VOLTAGE TO THE LAMP USING THE CONNECTOR GROUND


- Measure the voltage between the inoperative demand lamp connector, harness side as follows:

Vehicles With Rear Headliner:

Vehicles Without Rear Headliner(Except Cutaway):

Cutaway Chassis Vehicles:

- Is the voltage greater than 10 volts?

Yes
INSTALL a new interior lamp for the lamp in question. REFER to Interior Lamp Service and Repair. TEST the system for normal operation.

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

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