Ford Mustang (1999-2004) Service Manual: Parking, Rear and License Lamps

Refer to Wiring Diagrams Cell 92 , Exterior for schematic and connector information.

Special Tool(s)

73 III Automotive Meter or equivalent 105-R0057

Inspection and Verification

1. Verify the customer concern by operating the parking lamps.

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

Visual Inspection Chart

Mechanical

Electrical

  • Damaged multifunction switch (13K359)

  • Damaged headlamp switch (11654)
  • Blown battery junction box (BJB) Fuse 2 (30A)
  • Damaged wiring harness
  • Loose or corroded connections
  • Damaged parking, rear or license lamp

3. If the concern is not visually evident, determine the symptom and proceed to Symptom Chart.

Symptom Chart

Condition Possible Sources Action
  • The parking, rear or license lamps are inoperative
  • BJB Fuse 2 (30A).
  • Circuitry.
  • Headlamp switch
  • GO to Pinpoint Test L .
  • One or more parking, rear or license bulbs(s) is inoperative
  • Parking, rear or license bulb(s).
  • Circuitry.
  • GO to Pinpoint Test M .
  • The parking, rear or license lamps are on continuously
  • Headlamp switch.
  • Circuitry
  • GO to Pinpoint Test N .

Pinpoint Tests

PINPOINT TEST L: THE PARKING, REAR OR LICENSE LAMPS ARE INOPERATIVE

Test Step Result / Action to Take
L1 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH Yes

GO to L2 .

No

REPAIR the circuit. TEST the system for normal operation.
  • Disconnect: Headlamp Switch C205.
  • Measure the voltage between headlamp switch C205 Pin B2, Circuit 195 (TN/WH), harness side and ground.

  • Is the voltage greater than 10 volts?
L2 CHECK CIRCUIT 14 (BN) FOR OPEN Yes

INSTALL a new headlamp switch; REFER to Lamp Switch-Headlamp . TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.
  • Measure the resistance between headlamp switch C205 Pin R, Circuit 14 (BN), harness side and ground.

  • Is the resistance less than 5 ohms?

PINPOINT TEST M: ONE OR MORE PARKING, REAR OR LICENSE LAMP(S) IS INOPERATIVE

Test Step Result / Action to Take
M1 CHECK THE VOLTAGE TO THE INOPERATIVE LAMP(S) Yes

REPAIR Circuit 1205 (BK) for an open.

TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation
  • Key in OFF position.
  • Disconnect: Inoperative Lamp.
  • Place the headlamp switch in the parking lamps ON position.
  • Measure the voltage between inoperative lamp connector Circuit 14 (BN), harness side and ground.
  • Is the voltage greater than 10 volts?

PINPOINT TEST N: THE PARKING, REAR OR LICENSE LAMPS ARE ON CONTINUOUSLY

Test Step Result / Action to Take
N1 CHECK THE HEADLAMP SWITCH Yes

REPAIR Circuit 14 (BN) for a short to battery. TEST the system for normal operation.

No

INSTALL a new headlamp switch; REFER to Lamp Switch-Headlamp . TEST the system for normal operation
  • Key in OFF position.
  • Disconnect: Headlamp Switch C205.
  • Key in ON position.
  • Are the parking, rear or licences lamps on?
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