Checking the Ground Terminal for the Upper Electronic Module (UEM)

Checking the ground terminal

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, see Connecting the breakout box Connecting the Breakout Box.





Is the value OK?

Yes - Fault Found

No - contact resistance and oxidation

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Checking for open-circuits, contact resistance and oxidation
Check the ground terminal 31/83. Check for an open-circuit. See (permanent open-circuit) Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check contact resistance and oxidation. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check connector 54/13 for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.









Continue - Verification

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Verification




Verification

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 (.





Is the value OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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Attempt New Test - Checking the ground terminal

FAULT-TRACING FAILED - No Fault Found

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