Ford Falcon. Manual — part 373

417-01-31 Exterior

Lighting 417-01-31

DIAGNOSIS AND TESTING (Continued)

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 57AZ (B)

0 volts, less than 5 ohms between LH fog lamp

LH fog lamp ground

and ground

2

Circuit 478C (BR-W)

0 volts, less than 5 ohms between LH fog lamp

LH fog lamp power input

and fog lamp relay

C-362 RH Fog Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 57AY (B)

0 volts, less than 5 ohms between RH fog lamp

RH fog lamp ground

and ground

2

Circuit 478B (BR-W)

0 volts, less than 5 ohms between RH fog lamp

RH fog lamp power input

and fog lamp relay

C-363 Fog Lamp Switch

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 1045M (BR)

0 volts, less than 5 ohms between fog lamp

Fog lamp switch power input from switch and tail lamp relay.

tail lamp relay

2

Circuit 477 (SB)

0 volts, less than 5 ohms between fog lamp

Fog lamp switch to fog lamp relay switch and fog lamp relay

Inspection and Verification

Visual Inspection Chart

Mechanical

Electrical

Fog lamp switch.

Power Distribution

Box (PDB):

Fuse 18 (20A)
Relay 1 (20A)

Circuitry

Fog Lamp bulbs

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417-01-32 Exterior

Lighting 417-01-32

DIAGNOSIS AND TESTING (Continued)

Symptom Chart

Condition

Source

Action

Both fog lamps are inoperative.

Power Distribution Box (PDB):

Go to PinPoint Test O

Fuse 18 (20A)
Relay 1 (20A)

Circuitry
Fog lamp switch

One fog lamp is inoperative.

Circuitry

Go to PinPoint Test P

Both fog lamps are on continuously.

Power Distribution Box (PDB):

Go to PinPoint Test Q

Relay 1 (20A)

Circuitry
Fog lamp switch

Fog lamp relay

Pinpoint Tests

Circuit 57AX (B) open

Both headlamps are inoperative

Circuit 478 (BR-W) open or short to ground

Possible causes:

Circuit 1045M (BR) open or short to ground
Fog lamp switch C-363
Circuit 477 (SB) open or short to ground

PINPOINT TEST O : BOTH FOG LAMPS ARE INOPERATIVE

Test Step

Result / Action to Take

O1

CHECK THE FOG LAMP SWITCH TO FOG LAMP RELAY

VOLTAGE

Disconnect: Fog lamp relay, PDB C-163 relay 1 (20A).

Yes

Go to O5

Turn ON fog lamps.

No

Measure the voltage between fog lamp relay, PDB C-163 relay 1,

Go to O2

circuit 477 (SB), harness side and ground.

Is the voltage greater than 10 volts?

O2

CHECK CIRCUIT 1045M (BR) VOLTAGE

Disconnect: Fog lamp switch C-363.

Yes

Go to O3

Measure the voltage between fog lamp switch C-363, circuit 1045M
(BR), harness side and ground.

No

Repair circuit 1045M (BR)

Is the voltage greater than 10 volts?

O3

CHECK CIRCUIT 477 (SB) FOR A SHORT TO GROUND

Measure the resistance between fog lamp relay, PDB C-163 relay 1,

Yes

circuit 477 (SB), harness side and ground.

Repair circuit 477 (SB).
Test the system for normal operation.

Is the resistance less than 5 ohms?

No

Go to O4

O4

CHECK CIRCUIT 477 (SB) FOR AN OPEN

Measure the resistance between the fog lamp relay, PDB C-163 relay

Yes

1, circuit 477 (SB), harness side and fog lamp switch C-363, circuit

Perform the fog lamp switch testing in Section

477 (SB), harness side.

000-00.
Test the system for normal operation.

Is the resistance less than 5 ohms?

No

Refer Circuit 477 (SB).
Test the system for normal operation.

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417-01-33 Exterior

Lighting 417-01-33

DIAGNOSIS AND TESTING (Continued)

Test Step

Result / Action to Take

O5

CHECK CIRCUIT 37H (SB) VOLTAGE

Measure the voltage between fog lamp relay, PDB C-163 relay 1,

Yes

circuit 37H (SB), harness side and ground

Go to O6

Is the voltage greater than 10 volts?

No

Repair circuit 37H (SB)Test the system for
normal operation.

O6

CHECK CIRCUIT 57AX (B) FOR AN OPEN

Measure the resistance between fog lamp relay, PDB C-363 relay 1,

Yes

circuit 57AX (B), harness side and ground.

Go to O7

Is the resistance less than 5 ohms?

No

Repair circuit 57AX (B)Test the system for
normal operation.

O7

CHECK CIRCUIT 478 (BR-W) FOR A SHORT TO

GROUND

Measure the resistance between fog lamp relay, PDB C-363 relay 1,

Yes

circuit 478A (BR-W), harness side and ground.

Repair circuit 478 (BR-W).
Test the system for normal operation.

Is the resistance less than 5 ohms?

No

Go to O8.

O8

CHECK CIRCUIT 478 (BR-W) FOR AN OPEN

Disconnect: RH fog lamp C-362.

Yes

Replace fog lamp relay, PDB C-163 relay 1

Measure the resistance between fog lamp relay, PDB C-363 relay 1,

(20A).

circuit 478A (BR-W), harness side and RH fog lamp C-362, circuit

Test the system for normal operation

478B, harness side.

No

Is the resistance less than 5 ohms?

Repair circuit 478 (BR-W).
Test the system for normal operation

One fog lamp is inoperative

Possible causes:

Circuit 478 (BR-W) open
Circuit 57 (B) open

PINPOINT TEST P : ONE FOG LAMP IS INOPERATIVE

Test Step

Result / Action to Take

P1

CHECK THE VOLTAGE TO THE INOPERATIVE FOG

LAMP

Disconnect: Inoperative fog lamp.

Yes

Repair circuit 57 (B).

Turn On Fog LampS.

Test the system for normal operation.

Measure the voltage between RH fog lamp C-362, circuit 478B

No

(BR-W), harness side or LH fog lamp C-360, circuit 478C (BR-W),

Repair circuit 478 (BR).

harness side and ground.

Test the system for normal operation.

Is the voltage greater than 10 volts?

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417-01-34 Exterior

Lighting 417-01-34

DIAGNOSIS AND TESTING (Continued)

Both fog lamps are on continuously

Possible causes:

For lamp switch C-363
Circuit 477 (SB) short to power
Fog lamp relay
Circuit 478 (BR-W) short to power

PINPOINT TEST Q : BOTH FOG LAMPS ARE ON CONTINUOUSLY

Test Step

Result / Action to Take

Q1

CHECK FOG LAMP SWITCH

Disconnect: Fog lamp switch C-363.

Yes

Go to R2

Are the fog lamps illuminated?

No

Perform the fog lamp switch testing in Section
000-00.
Test the system for normal operation.

Q2

CHECK CIRCUIT 478 A (BR=W) FOR A SHORT TO

POWER

Disconnect: Fog lamp Relay, PDB C-163 Relay 1.

Yes

Repair circuit 478 (BR-W). Test the system for

Are the fog lamps illuminated?

normal operation.

No

Go to Q3

Q3

CHECK CIRCUIT 477 A (SB) FOR A SHORT TO POWER

Measure the voltage between fog lamp relay, PDB C-163 relay 1,

Yes

circuit 477 (SB), harness side and ground

Repair circuit 477 (SB).
Test the system for normal operation.

Is the voltage greater than 10 volts?

No

Replace fog lamp relay, PDB C-163 relay 1
(20A).
Test the system for normal operation.

Parking, Rear and License Lamps
Connector Circuit Reference

C-44 Wagon LH Tail Lamp

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