Pinpoint Test H: The Stoplamps Are On Continuously

Stoplamps

Pinpoint Test

Pinpoint Test H: The Stoplamps Are On Continuously

Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number

Normal Operation

When the brake pedal is applied, voltage is routed to the high mounted stoplamp and the multifunction switch. The multifunction switch then routes the voltage to the LH and RH rear lamps. Voltage to the LH and RH rear lamps also routes through the Battery Junction Box (BJB) fuses 42 (7.5A) and 38 (7.5A) for the trailer tow lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Stoplamp switch
- Multifunction switch



PINPOINT TEST H: THE STOPLAMPS ARE ON CONTINUOUSLY

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H1 CHECK THE STOPLAMP SWITCH


- Disconnect: Stoplamp Switch C278.
- Do the stoplamps continue to illuminate?

Yes
GO to H2 .

No
INSTALL a new stoplamp switch. REFER to Stoplamp Switch Service and Repair. TEST the system for normal operation.

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H2 CHECK THE RH STOP/TURN LAMP CIRCUIT FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: BJB Fuse 38 (7.5A).
- Do the stoplamps continue to illuminate?

Yes
GO to H3.

No
REPAIR circuit CAT09 (GN) for a short to voltage. TEST the system for normal operation.

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H3 CHECK THE LH STOP/TURN LAMP CIRCUIT FOR A SHORT TO VOLTAGE


- Disconnect: BJB Fuse 42 (7.5A).
- Do the stoplamps continue to illuminate?

Yes
GO to H4.

No
REPAIR circuit CAT06 (YE) for a short to voltage. TEST the system for normal operation.

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H4 CHECK THE MULTIFUNCTION SWITCH


- Disconnect: Multifunction Switch C202a.
- Do the stoplamps continue to illuminate?

Yes
If the high mounted stoplamp continues to illuminate, REPAIR circuit CCB08 (VT/WH). TEST the system for normal operation.

If the LH rear stoplamp continues to illuminate, REPAIR circuit CLS35 (VT). TEST the system for normal operation.

If the RH rear stoplamp continues to illuminate, REPAIR circuit CLS36 (YE). TEST the system for normal operation.

No
INSTALL a new multifunction switch. REFER to Steering Column. TEST the system for normal operation.

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