Pinpoint Test J: The Stoplamps Are On Continuously

Stoplamps

Pinpoint Test J: 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, the stoplamp switch routes voltage to the multifunction switch and the circuit filter. The multifunction switch then routes the voltage to the LH and RH rear lamps. The circuit filter routes the voltage to the high mounted stoplamp.

This pinpoint test is intended to diagnose the following:

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


PINPOINT TEST J: THE STOPLAMPS ARE ON CONTINUOUSLY

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J1 CHECK THE STOPLAMP SWITCH


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

Yes
GO to J2.

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

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J2 CHECK THE HIGH MOUNTED STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE


- Disconnect: Circuit Filter C3148.
- Does the high mounted stoplamp continue to illuminate?

Yes
REPAIR circuit 511 (LG) for a short to voltage. TEST the system for normal operation.

No
GO to J3.

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J3 CHECK THE STOPLAMP SWITCH OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE


- Connect: Circuit Filter C3148.
- Disconnect: Multifunction Switch C202c.
- Does the high mounted stoplamp continue to illuminate?

Yes
REPAIR circuit 10 (LG/RD) for a short to voltage. TEST the system for normal operation.

No
GO to J4.

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J4 CHECK THE REAR LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE


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

Yes
If the LH rear stoplamp continues to illuminate, REPAIR circuit 9 (LG/OG). TEST the system for normal operation.

If the RH rear stoplamp continues to illuminate, REPAIR circuit 5 (OG/LB). TEST the system for normal operation.

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

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