Checking the grounding

/ 900 / 1998 / 3. Electrical system / Information Display (SID) / Fault diagnosis on the basis of fault symptoms / Checking the grounding

Connect a BOB and check whether voltage is present on pin 20 by taking a reading across pin 20 and battery positive. The reading should be 12 V.

Important
Disconnect the battery cable before removing the grounding point. If this is not done the control modules in the car could be rendered unserviceable.

If the voltage reading is not OK, check the wiring for continuity/shorting. Also inspect grounding point G3S visually, unscrew and clean the contact surfaces. Reconnect the grounding point and battery cable, and repeat point 1.

Checking the grounding

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