Ford Falcon. Manual — part 372

417-01-27 Exterior

Lighting 417-01-27

DIAGNOSIS AND TESTING (Continued)

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 10C (G-R)

0 voltage, less than 5 ohms between stop lamp

Stop lamp power input

and brake switch

2

Circuit 57D (B)

0 voltage, less than 5 ohms between stop lamp

Stop lamp ground

and chassis ground

Inspection and Verification

Visual Inspection Chart

Mechanical

Electrical

Brake switch

Junction Box (JB):

fuse 7 (15A)

Circuitry

Stop Lamp bulbs

Symptom Chart

Condition

Source

Action

Both stop lamps are inoperative

Junction Box (JB):

Go to PinPoint Test L

fuse 7 (15A)

Circuitry
Brake switch

One or more stop lamps are

Circuitry

Go to PinPoint Test M

inoperative

Stop Lamp bulbs

The stop lamps are continuously on

Circuitry

Go to PinPoint Test N

Brake switch

Pinpoint Tests

Both headlamps are inoperative

Possible causes:

Circuit 10AA (G-R) open or short to ground.
Brake switch C-191.
Circuit 10Y (G-R) open or short to ground .

PINPOINT TEST L : THE STOP LAMPS ARE INOPERATIVE

Test Step

Result / Action to Take

L1

CHECK THE BRAKE SWITCH INPUT VOLTAGE

Disconnect: brake switch C-191.

Yes

Go to L2.

Turn ON ignition.

No

Measure the voltage between the brake switch C-191, circuit 10AA

Repair circuit 10AA (G-R).

(G-R), harness side and ground.

Test the system for normal operation.

Is the voltage greater than 10 volts?

L2

CHECK THE CIRCUIT 10Y (G-R) FOR A SHORT TO

GROUND

Measure the resistance between the brake switch C191, circuit 10Y

Yes

(G-R), harness side and ground.

Repair circuit 10Y (G-R)
Test the system for normal operation.

Is the resistance less than 5 ohms?

No

Go to L3.

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417-01-28 Exterior

Lighting 417-01-28

DIAGNOSIS AND TESTING (Continued)

Test Step

Result / Action to Take

L3

CHECK CIRCUIT 10 (G-R) FOR AN OPEN

Disconnect: Inoperative tail lamp.

Yes

Perform the brake switch testing in Section

Measure the resistance between the brake switch C191, circuit 10Y

206-06.

(G-R), harness side and inoperative tail lamp (one of the following):

Test the system for normal operation.

SWB Left tail lamp C-78, circuit 10A (G-R), harness side

No

SWB Right tail lamp C-77, circuit 10B (G-R), harness side

Repair circuit 10 (G-R).

SWB High mount stop lamp C-39, circuit 10D (G-R),

Test the system for normal operation.

harness side
LWB High mount stop lamp C-39, circuit 10Z (G-R),
harness side
Wagon Left tail lamp C-44, circuit 10A (G-R), harness side
Wagon Right tail lamp C-45, circuit 10B (G-R), harness side
Wagon High mount stop lamp C-39, circuit 10 (G-R),
harness side
Ute non-SSB Left tail lamp C-707, circuit 10C (G-R),
harness side
Ute non-SSB Right tail lamp C-705, circuit 10A (G-R),
harness side
Ute SSB Left tail lamp C-708, circuit 10C (G-R), harness
side
Ute SSB Right tail lamp C-706, circuit 10A (G-R), harness
side

Is the resistance less than 5 ohms?

One or more stop lamps are inoperative

Possible causes:

Circuit 10 (G-R) open.
Circuit 57 (B) open.

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417-01-29 Exterior

Lighting 417-01-29

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST M : ONE OR MORE STOP LAMPS ARE INOPERATIVE

Test Step

Result / Action to Take

M1

CHECK CIRCUIT 10 (G-R) FOR AN OPEN

Disconnect: Inoperative stop lamp.

Yes

Perform the brake switch testing in Section

Turn ON ignition.

206-06.
Test the system for normal operation.

Measure the voltage between the brake switch C-191, circuit 10AA
(G-R), harness side and inoperative tail lamp.

No

SWB LH tail lamp C-78, circuit 10A (G-R), harness side

Repair circuit 10 (G-R).

SWB RH tail lamp C-77, circuit 10B (G-R), harness side

Test the system for normal operation.

SWB High mount stop lamp C-39, circuit 10D (G-R),
harness side
LWB High mount stop lamp C-39, circuit 10Z (G-R),
harness side
Wagon LH tail lamp C-44, circuit 10A (G-R), harness side
Wagon RH tail lamp C-45, circuit 10B (G-R), harness side
Wagon High mount stop lamp C-39, circuit 10 (G-R),
harness side
Ute cab chassis LH tail lamp C-707, circuit 10C (G-R),
harness side
Ute cab chassis RH tail lamp C-705, circuit 10A (G-R),
harness side
Ute style side box LH tail lamp C-708, circuit 10C (G-R),
harness side
Ute style side box RH tail lamp C-706, circuit 10A (G-R),
harness side

Is the resistance less than 5 ohms?

The stop lamps are continuously on

Possible causes:

Brake switch C-191
Circuit 10 (G-R) short to power

PINPOINT TEST N : THE STOP LAMPS ARE CONTINUOUSLY ON

Test Step

Result / Action to Take

N1

CHECK THE CIRCUIT 10Y (G-R) FOR A SHORT TO

POWER

Disconnect: brake switch C-191.

Yes

Repair circuit 10 (G-R).

Are the stop lamps illuminated?

Test the system for normal operation.

No

Perform the brake switch testing in Section
206-06.
Test the system for normal operation.

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417-01-30 Exterior

Lighting 417-01-30

DIAGNOSIS AND TESTING (Continued)

Fog Lamps
Connector Circuit Reference

C-163 Power Distribution Box (PDB)

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 37H (Y)

Greater than 10 volts and 10,000 between fog

Battery to fog lamp relay

lamp relay and ground

2

Circuit 57AX (B)

0 volts, less than 5 ohms between fog lamp relay

Fog lamp relay ground

and ground

3

477 (SB)

0 volts, less than 5 ohms between fog lamp

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

4

478A (BR-W)

0 volts, less than 5 ohms between fog lamp relay

Fog lamp relay to fog lamps

and fog lamps

C-360 LH Fog Lamp

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