Checking the Power Supply and Ground. Intermittent Fault

Checking the power supply and ground Intermittent fault

Checking the power supply
Check interior fuse 24 (11C/24:2).
Check the wire between combined instrument power supply relay (2/29) 3 and interior fuse 24 (11C/24:2) for an open circuit as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and for a short circuit to ground as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check that the relay is not defective.
Check and measure wire between combined instrument 6 and handbrake contact 1 for a short circuit to ground as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the wire between combined instrument 1 and combined instrument power supply relay (2/29) 1 for an open circuit as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and a short circuit to ground as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the wire between combined instrument 14 and ground for an open circuit as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and for a short circuit to voltage supply as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Do the necessary corrective action.

Additional information:
- To connect the test box, see Connecting the Driver Information Module (DIM) test box Connecting the Driver Information Module (DIM) Test Box.










Continue - Checking the ground terminals

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Checking the ground terminals




- Ignition off.
- Control unit disconnected.
- Switch off all battery loadings such as entrance lighting and radio.
Connect an ohmmeter between the battery negative lead and test box 14.

Additional information
- To connect the test box, see Connecting the Driver Information Module (DIM) test box Connecting the Driver Information Module (DIM) Test Box
- For information on signals and additional values, see Driver Information Module (DIM) signal description Signal Specification, Driver Information Module (DIM).








ohms
The ohmmeter should display approximately 0.

OK - Fault Found

Not OK - contact resistance and oxidation.

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Checking for open circuits, contact resistance and oxidation.
Check ground points 53/400 and 31/83 for an open circuit as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and for contact resistance and oxidation as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Additional information
- For information on ground terminals, see Service Handbook, Section 3, Wiring Diagram.





Is there a fault?

Yes - Fault Found

No - No Fault Found

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