Engine JAC HFC4DA1-2C. Manual — part 70
LT
LT
LT
LT Lighting
Lighting
Lighting
Lighting System
System
System
System
- 70 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Fault
Fault
Fault
Fault diagnosis
diagnosis
diagnosis
diagnosis
9.
Diagnostic program for front rear fog lamp
Step
Operation
Yes
No
1
Set the lamp switch to “
” position, turn on the front fog lamp
switch and check whether the switch indicator is intact.
Go to Step 7.
Go to Step 2.
2
Is the Fuse 9 intact?
Go to Step 4.
Go to Step 3.
3
Replace the damaged fuse.
Go to Step 4.
4
Remove the front fog lamp relay and measure the relay voltage. Is the voltage
normal?
Go to Step 6.
Go to Step 5.
5
Check whether the instrument panel harness and the front fog lamp switch
circuit is normal as per circuit diagram. Replace when necessary.
6
Replace relay. Are fog lamps normal?
Go to Step 7.
7
Check fog lamp connector. Are voltage and grounding normal?
Go to Step 8.
8
Check instrument panel harness from relay to fog lamp as per circuit diagram.
LT
LT
LT
LT Lighting
Lighting
Lighting
Lighting System
System
System
System
- 71 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Fault
Fault
Fault
Fault diagnosis
diagnosis
diagnosis
diagnosis
10. Rear fog lamp failed with front fog lamp and rear fog lamp turned on simultaneously
Step
Operation
Yes
No
1
Turn on low beam and front fog lamp and then turn on rear fog lamp switch.
Does the switch indicator operate normally?
Go to Step 2.
Go to Step 6.
2
Check rear fog lamp and wiring harness connector. Ensure voltage and
grounding is normal.
Go to Step 3.
Go to Step 11.
3
Check connector between instrument panel and rear body harness. Is the
measured voltage normal?
Go to Step 4.
Go to Step 5.
4
Check rear body harness from connector and rear fog lamp. Repair when
necessary.
5
Check instrument panel harness from rear fog lamp switch to connector.
Repair when necessary.
6
Remove the rear fog lamp switch. Measure the voltage of wiring harness. Is
the voltage normal?
Go to Step 7.
Go to Step 8.
7
Replace the rear fog lamp switch. Is the rear fog lamp normal?
Go to Step 3.
8
Replace the relay. Is the rear fog lamp normal?
Go to Step 9.
9
Check the instrument panel harness from relay to switch. Is it normal??
Go to Step 10.
10
Check the instrument panel harness connected to rear fog lamp relay. Repair
when necessary.
11
Replace rear fog lamp.
LT
LT
LT
LT Lighting
Lighting
Lighting
Lighting System
System
System
System
- 72 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Fault
Fault
Fault
Fault diagnosis
diagnosis
diagnosis
diagnosis
11. Diagnostic program for reversing lamps
Step
Operation
Yes
No
1
Is the fuse intact?
Go to Step 3.
Go to Step 2.
2
Replace the damaged fuse. Are the reversing lamps intact?
Go to Step 3.
3
Check connector between instrument panel and rear body harness. Is the
measured voltage normal?
Go to Step 4.
Go to Step 6.
4
Check connector between reversing lamp and wiring harness. Is it normal??
Go to Step 5.
Go to Step 10.
5
Check rear body harness from connector to reversing lamp.
6
Disconnect the connector of reversing lamp switch. Is the measured voltage
normal?
Go to Step 8.
Go to Step 7.
7
Check the instrument panel harness from fuse to reversing lamp switch.
8
Check the instrument panel harness from connector of reversing lamp switch
to joint. Is it normal??
Go to Step 9.
9
Check connector between brake lamps and wiring harness.
Go to Step 10.
10
Check the ground point of rear body harness. Is it well grounded?
LT
LT
LT
LT Lighting
Lighting
Lighting
Lighting System
System
System
System
- 73 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Fault
Fault
Fault
Fault diagnosis
diagnosis
diagnosis
diagnosis
12. Diagnostic program for brake lamps
Step
Operation
Yes
No
1
Turn on the ignition switch to check fuse. Is the fuse intact?
Go to Step 3.
Go to Step 2.
2
Please replace the damaged fuse. Does it still fail after replacement?
Go to Step 5.
Go to Step 3.
3
Measure the fuse voltage. Is it normal?
Go to Step 5.
Go to Step 4.
4
Check the instrument panel harness.
5
Disconnect the brake switch connector and check the brake switch. Ensure the
brake switch is normal. Is the measured voltage normal?
Go to Step 7.
Go to Step 6.
6
Check the instrument panel harness from brake switch to fuse.
7
Check connector between instrument panel and rear body harness. Is it normal??
Go to Step 8.
8
Check the rear body harness from connector to brake lamp.
Go to Step 9.
9
Check the connector between brake lamp and wiring harness.
Go to Step 10.
10
Check the ground point of rear body harness. Is it well grounded?
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