Diagnostic Aids
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If the DTC B1477 or B1478 is a history DTC, the fault may be intermittent. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .
The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground or to battery in the WND RAP relay control circuit.
- The WND RAP relay coil is shorted to ground or to battery internally.
- The BCM is shorted to ground or to battery internally.