Diagnostic Aids
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- The following conditions may cause an intermittent malfunction:
- An intermittent short in the steering column lock relay.
- An intermittent open in BCM battery positive voltage circuit from BCM2 fuse.
- Steering column lock and unlock circuits shorted together or to ground.
- A short to ground in the BCM battery positive voltage circuit will cause the BCM2 fuse to open. The BCM receives supply voltage for the steering column lock motor through the BCM battery positive voltage circuit. If the BCM is unable to supply voltage to the steering column lock motor through the BCM battery positive voltage circuit, the BCM will set a DTC B2587.
- An internally shorted steering column lock relay may set this DTC.
- Disconnecting or opening the steering column lock feedback circuit with the ignition in the ON position will cause the BCM to enter a Fail Enable Standby mode. The steering column will remain inoperative until the Fail Enable Standby mode is cleared. To clear this mode, disconnect the BCM1 & IPC fuse in the I/P fuse block for 15 seconds.
- The BCM1 fuse will become open if the steering column lock motor or the steering column lock or unlock circuits are shorted together or to ground.
- If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur.