B1408 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1408 – Passenger Side Curtain Deployment Control 1 Circuit

 

B1408 Possible Symptoms

 

Air Bag Warning Light ON

 

B1408 Possible Causes

 

Faulty Passenger Side Curtain,Passenger Side Curtain harness is open or shorted,Passenger Side Curtain circuit poor electrical connection,Faulty Restraint Control Module (RCM)

 

B1408 Description

 

The Restraint Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the value displayed is lower or higher than the desired range, the RCM can set a Diagnostic Trouble Code (DTC). As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern.