LIGHTING SYSTEM - Troubleshooting

T-72prose procedure

Troubleshooting

IMPORTANT

Symptom: Back-up light(s) does not operate.

1
Check METER 10A fuse. If the fuse is burned, replace it. Check and repair the wire harness, if necessary. If the fuse is OK, go to Step 2.
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2
Check the back-up light bulbs. If a bulb is burned, replace it. If the bulbs are OK, go to Step 3.
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3
1. Turn the ignition switch ON, and shift the transmission to reverse. 2. Measure the voltage at the terminal-wires of the back-up light connectors.
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Back-up light	Wire	Voltage	Action
Left	(R/G)	12V	Next, check wire (B)
Left	(R/G)	0V	Go to Step 4
Left	(B)	12V	Repair ground wire (B)
Left	(B)	0V	Check for poor connection of back-up light connector
Right	(R/G)	12V	Next, check wire (B)
Right	(R/G)	0V	Go to Step 4
Right	(B)	12V	Repair ground wire (B)
Right	(B)	0V	Check for poor connection of back-up light connector

Left

Wire(R/G)

Voltage12V

ActionNext, check wire (B)

Left

Wire(R/G)

Voltage0V

ActionGo to Step 4

Left

Wire(B)

Voltage12V

ActionRepair ground wire (B)

Left

Wire(B)

Voltage0V

ActionCheck for poor connection of back-up light connector

Right

Wire(R/G)

Voltage12V

ActionNext, check wire (B)

Right

Wire(R/G)

Voltage0V

ActionGo to Step 4

Right

Wire(B)

Voltage12V

ActionRepair ground wire (B)

Right

Wire(B)

Voltage0V

ActionCheck for poor connection of back-up light connector