Diagnostic Aids

WARNING: This page is about a different car, the 1988 Buick Riviera and 1988 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.

Any electrical failure that prevents the main relay from providing switched power to EBCM pins No. 3 and 20 will prevent EBCM from powering up. The ANTI-LOCK light will remain on continuously.

Fig 1: Main Relay Circuits Schematic

Fig 2: Flow Chart B4, Main Relay Circuits

Fig 3: Flow Chart B4, Main Relay Circuits (1 of 3)

Fig 4: Flow Chart B4, Main Relay Circuits (2 of 3)

Fig 5: Flow Chart B4, Main Relay Circuits (2 of 3)