Checking For Open Circuits And Short Circuits
Check the wire between the upper electronic module and the control unit of the rear reading lamp unit for a short circuit to ground, as described in, see SHORT-CIRCUIT TO GROUND, PERMANENT FAULTS .
Remove the connector from the roof lamp unit and measure between the connector and the UEM as described below.
UEM-0030 Rear left reading lamp
Control unit #20 and reading lamp unit #1.
UEM-0032 Rear right reading lamp
Control unit #20 and reading lamp unit #7.
Check the wire between the upper electronic module and the control unit of the rear reading lamp unit for an open circuit, as described in, see OPEN-CIRCUIT, PERMANENT FAULTS .
UEM-0030 Rear left reading lamp
Control unit #7 and reading lamp unit #1.
UEM-0032 Rear right reading lamp
Control unit #17 and reading lamp unit #7.
If a fault is found, replace the wire.
If the wire is OK, test with a new bulb.
Additional information:
- For information on signals and additional values, see SIGNAL DESCRIPTION, UPPER ELECTRONIC MODULE (UEM) .
- To connect the test box, see CONNECTING THE BREAKOUT BOX .
- To replace the bulb, see BULB, READING LAMP, REAR, REPLACING .
- Continue
Refer to VERIFICATION