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 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 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 specification .
- To connect the test box, see Connecting the breakout box .
- To replace the bulb, see Bulb, reading lamp, rear, replacing .
- Continue
Refer to Verification