B0005 MERCURY Possible Causes
- Faulty deployable steering column
- Deployable steering column wiring harness is open or shorted
- Poor electrical connection in the deployable steering column circuit
- Faulty Restraint Control Module (RCM)
How to Fix B0005 MERCURY Code?
Start by checking the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Technical Notes
What Does It Mean?
B0005: Deployable steering column deployment control 12: short to battery
B0005: Deployable steering column deployment control 13: circuit open
B0005: Deployable steering column deployment control 1A: circuit resistance below threshold
B0005: Deployable steering column deployment control 2B: cross-coupled signal
B0005: Deployable steering column deployment control 4A: incorrect component installed
Possible Symptom
Airbag warning light illuminated
B0005 MERCURY Meaning
The Restraint Control Module (RCM) monitors the resistance of the deployment loop to determine if a fault exists. The value displayed in the Parameter Identification (PID) is the deployment loop resistance measured by the RCM. If the displayed value is below or above the desired range, the RCM may set a Diagnostic Trouble Code (DTC). As the deployment loop resistance moves further away from the desired range, the likelihood of a DTC increases. Small resistance variations can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and movement of the wiring harness and may cause an increase in resistance due to wire tension. These variables can lead to an intermittent fault. For this reason, the test requires the Parameter Identification (PID) value to be within the desired range before the fault is considered repaired, even if the module reports a DTC on demand at the time of diagnosis. Following this direction helps ensure that minor resistance changes do not create a recurring problem. This test uses the process of elimination to diagnose each part of the deployment loop circuit, including wiring, connections, the deployable steering column, and the RCM.