LIGHTING SYSTEM

T-90prose procedure

Troubleshooting

IMPORTANT

Symptom: Illumination lamp control does not operate.

1
Turn the headlight switch ON.
2
Set the panel lamp control switch to Max. position.
3
Measure the voltage at the following terminal wires of the panel lamp control switch connector.
05U0TX-326

Wire	Voltage	Action
(B)	0V	Next check wire (R/B)
(B)	Other 0V	Repair wire (B) (Panel lamp control switch — Body ground)
(R/B)	12V	Next check wire (R)
(R/B)	0V	Repair wire (R/B) (TAIL 15A fuse — Panel lamp control switch)
(R)	0V	Repair wiring harness (Panel lamp control switch — Each lamp)
(R)	Other 0V	Replace panel lamp control switch

(B)

Voltage0V

ActionNext check wire (R/B)

(B)

VoltageOther 0V

ActionRepair wire (B) (Panel lamp control switch — Body ground)

(R/B)

Voltage12V

ActionNext check wire (R)

(R/B)

Voltage0V

ActionRepair wire (R/B) (TAIL 15A fuse — Panel lamp control switch)

(R)

Voltage0V

ActionRepair wiring harness (Panel lamp control switch — Each lamp)

(R)

VoltageOther 0V

ActionReplace panel lamp control switch

1
Remove the panel lamp control switch.
2
Apply 12V to terminal d and ground terminal g.
05U0TX-327
3
Check that the voltage at terminal a changes linealy when turning the control switch.
4
If not as specified, replace the panel lamp control switch.

Switch	Voltage
Min. position	10V
Max. position	0V

Min. position

Voltage10V

Max. position

Voltage0V