RWAL Power Relay
- Disconnect negative battery cable. Remove radio speaker (if equipped) from lower left side of dash. Remove engine ECM with cover, bracket and fuse box from steering column holder.
- Disconnect Yellow connector from RWAL power relay. Remove relay. Check continuity across relay terminals "B" and "D". See Fig 1
. Resistance should be 90-110 ohms.
- Check resistance across relay terminals "A" and "B". Reading should be infinite. Apply battery voltage and ground across terminals "C" and "D", continuity should exist between terminals No. 2 and 4. If relay does not test as indicated, replace relay.
Courtesy of GENERAL MOTORS CORP.