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General Procedures > < Fog Lamps

Focus RS 2003 (09.2002-)

Exterior Lighting - Reversing Lamps Focus RS 2003 (09/2002-)
Diagnosis and Testing

Refer to Wiring Diagrams Section 417-01, for schematic and connector information.

Special Tool(s)

Terminal probe kit

29-011A

Inspection and Verification

  1. Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Electrical
  • Fuse(s)
  • Bulb(s)
  • Electrical connector(s)
  • Wiring harness
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
The reversing lamp is inoperative
*
Fuse
*
Circuit(s)
*
Transmission switch
*
Central Junction Box (CJB)
*
GO to Pinpoint Test A.
The reversing lamp is on continuously
*
Circuit(s)
*
Light switch
*
Transmission switch
*
GO to Pinpoint Test B.

Pinpoint Tests

PINPOINT TEST A : THE REVERSING LAMP IS INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: CHECK FUSE F53 (CJB)
1
Ignition switch in position 0.
2
Disconnect Fuse F53 (CJB).
3
CHECK Fuse F53 (10 A) (CJB).

Is the fuse OK?
Yes
GO to A2.
No
INSTALL a new fuse F53 (10 A) and TEST the system for normal operation. If the fuse blows again, LOCATE and REPAIR the short to ground by using the wiring diagrams. TEST the system for normal operation.
A2: CHECK THE VOLTAGE AT FUSE F53 (CJB)
1
Connect Fuse F53 (CJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F53 (CJB) and ground.

Is battery voltage indicated?
Yes
GO to A3.
No
LOCATE and REPAIR the open in the power supply of fuse F53 (CJB) by using the wiring diagrams. TEST the system for normal operation. If necessary CHECK the CJB and INSTALL a new one. TEST the system for normal operation.
A3: CHECK THE POWER SUPPLY OF THE TRANSMISSION SWITCH
1
Ignition switch in position 0.
2
Disconnect Transmission switch from connector C864.
3
Ignition switch in position II.

4
Measure the voltage between transmission switch, connector C864, Pin 2, circuit 15-LG28 (GN/WH), harness side and ground.

Is battery voltage indicated?
Yes
GO to A4.
No
LOCATE and REPAIR the open in circuit 15-LG28(A) (GN/WH) between fuse F53 (CJB) and transmission switch by using the wiring diagrams. TEST the system for normal operation.
A4: CHECK THE TRANSMISSION SWITCH
1
Ignition switch in position 0.

2
Connect a fused jumper wire (10 A) at the transmission switch, connector C864, between pin 2, circuit 15-LG28 (GN/WH), harness side and pin 1, circuit 15S-LG3 (GN/YE), harness side.
3
Ignition switch in position II.
4
Check the reversing lamp.

Does the reversing lamp illuminate?
Yes
INSTALL a new transmission switch. TEST the system for normal operation.
No
GO to A5.
A5: CHECK THE POWER SUPPLY OF THE REVERSING LAMP
1
Ignition switch in position 0.
2
Connect Transmission switch with connector C864.
3
Disconnect Reversing lamp from connector:.
  • LHD: C430
  • RHD: C434
4
Ignition switch in position II.
5
Engage the REVERSE GEAR.

6
Measure the voltage between reversing lamp:
  • LHD: right hand side, connector C430, pin 1, circuit 15S-LG9 (GN/BK), harness side and ground.
  • RHD: left hand side, connector C434, pin 1, circuit 15S-LD6 (GN/YE), harness side and ground.

Is battery voltage indicated?
Yes
LOCATE and REPAIR the open in circuit(s) between reversing lamp and ground G46 by using the wiring diagrams. TEST the system for normal operation. If necessary CHECK the reversing lamp and INSTALL a new one. TEST the system for normal operation.
No
LOCATE and REPAIR the open in circuit(s) between transmission switch and reversing lamp by using the wiring diagrams. TEST the system for normal operation. If necessary CHECK the reversing lamp and INSTALL a new one. TEST the system for normal operation.

PINPOINT TEST B : THE REVERSING LAMP IS ON CONTINUOUSLY
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: CHECK THE SYSTEM BY USING THE WDS
1
Connect the diagnostic tool.
2
Check the system by using the WDS.

Are any error-codes (DTC's) indicated?
Yes
WORK through the DTC's, according to the WDS instruction. CLEAR the error memory and TEST the system for normal operation.
No
GO to B2.
B2: CHECK THE TRANSMISSION SWITCH
1
Ignition switch in position 0.
2
Disconnect Transmission switch from connector C864.
3
Ignition switch in position II.
4
Check the reversing lamp.

Does the reversing lamp illuminate?
Yes
LOCATE and REPAIR the short to power in circuit(s) connected with transmission switch, connector C864, pin 1 by using the wiring diagrams. TEST the system for normal operation.
No
INSTALL a new transmission switch. TEST the system for normal operation.

General Procedures > < Fog Lamps