Ford Falcon. Manual — part 376

417-01-43 Exterior

Lighting 417-01-43

DIAGNOSIS AND TESTING (Continued)

C-44 Wagon LH Tail Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 140A (R-B)

0 voltage, less than 5 ohms between LH reverse

LH reverse lamp power input

lamp and either inhibitor switch and prndl switch

or reverse lamp switch

2

Circuit 57EJ (B)

0 voltage, less than 5 ohms between LH tail

LH tail lamp ground

lamp and chassis ground

C-45 Wagon RH Tail Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 140B (R-B)

0 voltage, less than 5 ohms between RH reverse

RH reverse lamp power input

lamp and either inhibitor switch and prndl switch

or reverse lamp switch

2

Circuit 57EK (B)

0 voltage, less than 5 ohms between RH tail

RH tail lamp ground

lamp and chassis ground

C-77 Sedan RH Tail Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 140B (R-B)

0 voltage, less than 5 ohms between RH reverse

RH reverse lamp power input

lamp and either inhibitor switch and prndl switch

or reverse lamp switch

2

Circuit 57EK (B)

0 voltage, less than 5 ohms between RH tail

RH tail lamp ground

lamp and chassis ground

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417-01-44 Exterior

Lighting 417-01-44

DIAGNOSIS AND TESTING (Continued)

C-78 Sedan LH Tail Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 140A (R-B)

0 voltage, less than 5 ohms between LH reverse

LH reverse lamp power input

lamp and either inhibitor switch and prndl switch

or reverse lamp switch

2

Circuit 57EJ (B)

0 voltage, less than 5 ohms between LH tail

LH tail lamp ground

lamp and chassis ground

C-705 Ute Cab Chassis RH Tail Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 140A (R-B)

0 voltage, less than 5 ohms between RH reverse

RH reverse lamp power input

lamp and either inhibitor switch and prndl switch

or reverse lamp switch

2

Circuit 57A (B)

0 voltage, less than 5 ohms between RH tail

RH tail lamp ground

lamp and chassis ground

C-714 Ute Back Up Lamp

Pin Number(s)

Circuit Designation/Description

Normal Condition/Measurement

1

Circuit 140 (R-B)

0 voltage, less than 5 ohms between back up

LH back up lamp power input

lamp and either inhibitor switch and prndl switch

or reverse lamp switch

2

Circuit 57C (B)

0 voltage, less than 5 ohms between back up

LH back up lamp ground

lamp and chassis ground

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417-01-45 Exterior

Lighting 417-01-45

DIAGNOSIS AND TESTING (Continued)

Inspection and Verification

Visual Inspection Chart

Mechanical

Electrical

Inhibitor switch and

Junction Box (JB):

PRNDL switch

Fuse 15 (15A)

Reverse lamp switch

Circuitry

Reverse lamp bulbs

Symptom Chart

Condition

Source

Action

The reversing lamps are inoperative

Power Distribution Box (PDB):

Go to PinPoint Test U

Fuse 15 (20A)
relay 4 (20 A)

Circuitry
Inhibitor switch and PRNDL switch
Reverse lamp switch

The individual reversing lamp is

Circuitry

Go to PinPoint Test V

inoperative

The reversing lamps are on

Circuitry

Go to PinPoint Test W

continuously

Inhibitor switch and PRNDL switch
Reverse lamp switch

Circuit 140 (W-R) open or short to ground

Pinpoint Tests

Circuit 57 (B) open

The reversing lamps are inoperative

Possible causes:

Circuit 140X (R-B) open or short to ground
Inhibitor switch and PRNDL switch C-26
Reverse lamp switch C-12

PINPOINT TEST U : THE REVERSE LAMPS ARE INOPERATIVE

Test Step

Result / Action to Take

U1

CHECK CIRCUIT 140X (R-B) VOLTAGE

Disconnect either:

Yes

Go to U2

(manual) Reverse Lamp Switch C-26.

(automatic) Inhibitor switch and PRNDL switch C-12.

No

Repair circuit 140X (R-B).

Turn ON ignition.

Test the system for normal operation.

Measure the voltage between (manual) Reverse Lamp Switch C-26,
circuit 140X (R-B), harness side or (automatic) Inhibitor switch and
PRNDL switch C-12, circuit 140X (R-B), harness side and ground.

Is the voltage greater than 10 volts?

U2

CHECK CIRCUIT 140 (W-R) FOR A SHORT TO GROUND

Measure the resistance between (manual) Reverse Lamp Switch

Yes

C-26, circuit 140 (W-R), harness side or (automatic) Inhibitor switch

Repair circuit 140 (W-R).

and PRNDL switch C-12, circuit 140 (W-R), harness side and ground. Test the system for normal operation.

Is the resistance less than 5 ohms?

No

Go to U3

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417-01-46 Exterior

Lighting 417-01-46

DIAGNOSIS AND TESTING (Continued)

Test Step

Result / Action to Take

U3

CHECK CIRCUIT 140 (W-R) FOR AN OPEN

Disconnect: Inoperative tail lamp.

Yes

Go to U4

Measure the resistance between (manual) Reverse Lamp Switch
C-26, circuit 140 (W-R), harness side or (automatic) Inhibitor switch

No

and PRNDL switch C-12, circuit 140 (W-R), harness side and

Repair circuit 140 (W-R).

inoperative tail lamp, circuit 140 (R-B), harness side.

Test the system for normal operation.

Is the resistance less than 5 ohms?

U4

CHECK CIRCUIT 57ER (B) FOR AN OPEN

Measure the resistance between inoperative tail lamp, circuit 57 (B),

Yes

harness side and ground.

Perform the inhibitor switch and PRNDL switch
or reverse lamp switch testing in Section 307-01.

Is the resistance less than 5 ohms?

Test the system for normal operation.

No

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

The individual reversing lamp is inoperative

Possible causes:

Circuit 140 (W-R)
open
Circuit 57 (B) open

PINPOINT TEST V : THE INDIVUDUAL REVERSING LAMP IS INOPREATIVE

Test Step

Result / Action to Take

V1

CHECK THE VOLTAGE TO THE INOPERATIVE

REVERSING LAMP

Set the parking brake.

Yes

Repair circuit 57(B).

Key in ON position.

Test the system for normal operation.

Disconnect: inoperative reversing lamp.

No

Select REVERSE.

Repair circuit 140(W-R).
Test the system for normal operation.

Measure the voltage between the:

sedan left tail lamp C-78, circuit 140A (R-B) harness side-
sedan right tail lamp C-77, circuit 140B (R-B) harness side

wagon left tail lamp C-44, circuit 140A (R-B) harness side.

wagon right tail lamp C-45, circuit 140B (R-B) harness side.

Ute, non-SSB, right tail lamp C-705, circuit 140A (R-B) harness side.
Ute, non-SSB, left tail lamp C-707, circuit 140C (R-B) harness side.

Ute, SSB, back up lamp C-714, circuit 140 (R-B) harness side and
ground.

Is the voltage greater than 10 V?

The reversing lamps are on continuously

Possible causes:

Inhibitor switch and PRNDL switch C-26
Reverse lamp switch C-12
Circuit 140 (W-R) short to power

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