Upper Electronic Module (UEM)

CHECKING THE GROUND TERMINAL FOR THE UPPER ELECTRONIC MODULE (UEM)

Checking the ground terminal



- Ignition off
- Control module disconnected
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).

Connect the breakout box.

Connect an ohmmeter between terminal #A20 on the breakout box and the battery negative terminal.

The ohmmeter should read 0 ohms.

Other information
- To connect the breakout box,

Is the value OK?
Yes - Testing Complete
No - Continue below.


Checking for open-circuits, contact resistance and oxidation



Check the ground terminal 31/83. Check for an open-circuit and contact resistance and oxidation. Checking Wiring and Terminals - Permanent Faults

Check connector 54/13 for contact resistance and oxidation according to Checking Wiring and Terminals - Permanent Faults


Verification



- Ignition off.
- Control unit disconnected
- Switch off all battery loadings such as entrance lights and radio.

Connect an ohmmeter between the battery negative terminal and test box A20. The ohmmeter should display 0 ohms.

Is the value OK?
Yes - Testing Complete
No - Continue below.


Fault-tracing information
The fault should be diagnosed and remedied.
Since this is not the case the fault-tracing process has failed.