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2004 Lincoln Navigator. No brake or # 3 brake lights all of the others do. Fuses are okay, the brake switch is okay.

1 Answer

Jeff Armer

Lincoln Master 3,418 Answers
Posted on Nov 23, 2022

Jeff Armer

Lincoln Master

Joined: Oct 21, 2018

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How do you know the brake light switch is ok ? Did you check (with a voltmeter) battery voltage at the switch.

Inspection and Verification

Verify the customer concern.

Visually inspect the following for obvious signs of mechanical or electrical damage.

Visual Inspection Chart Mechanical Electrical
- Central junction box (CJB)
- Brake pedal position (BPP) switch
- Multifunction switch
- CJB fuse 2 (20A)
- Circuitry
- Stoplamp bulbs

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.

Jeff Armer Nov 23, 2022

PINPOINT TEST H: THE STOPLAMPS ARE INOPERATIVE
Test Step Result / Action to Take
H1 CHECK CIRCUIT 10 (LG/RD) FOR AN OPEN
Disconnect: BPP Switch C278.
Measure the voltage between BPP switch C278 pin 1, circuit 10 (LG/RD), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to H2 .

No
REPAIR the circuit. TEST the system for normal operation.
H2 CHECK THE BPP SWITCH
Connect a fused jumper wire (20A) between BPP C278 pin 1, circuit 10 (LG/RD), harness side and BPP C278 pin 2, circuit 511 (LG), harness side.

Do the stoplamps operate?
Yes
INSTALL a new BPP switch. REFER to Brake Pedal Position (BPP) Switch in this section.

No
REPAIR circuit 511 (LG). TEST the system for normal operation.

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2004 Lincoln Navigator. No brake or # 3 brake lights all of the others do. Fuses are okay, the brake switch is okay.

1 Answer

Jeff Armer

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2004 Lincoln Navigator. No brake or # 3 brake lights all of the others do. Fuses are okay, the brake switch is okay.

1 Answer

Jeff Armer

Add Your Answer

Attachments: Added items

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