Pinpoint Test A: The Air Bag Warning Indicator Is Illuminated Continuously

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.

WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.

NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

NOTE: SRS components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

A1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs
- Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
- Were any continuous or on-demand DTCs retrieved?
1. YES : If continuous memory DTCs were retrieved, go to A2. If on-demand DTCs were retrieved, go to the Supplemental Restraint System (SRS) DTC Chart for pinpoint test direction.
2. NO : Go to A2.
A2 CHECK THE RCM CONNECTION
- Key in OFF position.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
- Connect: RCM C2041a
- Make sure RCM C2041a is connected and fully seated.
- Is RCM C2041a fully connected and the connector locking tab engaged?
1. YES : Go to A3.
2. NO : CONNECT C2041a and ENGAGE the locking tab. Go to A5.
A3 CHECK CIRCUIT 608 (BK/YE) FOR AN OPEN
- Disconnect: IC Module C220
- Disconnect: RCM C2041a
- Measure the resistance between IC module C220-24, circuit 608 (BK/YE), harness side and RCM C2041a-19, circuit 608 (BK/YE), harness side.
- Is the resistance less than 0.5 ohm?
1. YES : Go to A4.
2. NO : REPAIR circuit 608 (BK/YE). Go to A5.
A4 CHECK THE AIR BAG WARNING INDICATOR OPERATION (DRIVE LAMP OFF)
- Deactivate the SRS. Refer to Supplemental Restraint System (SRS) Deactivation and Reactivation .
- Connect: IC Module C220
- Key in ON position.
- Connect a fused jumper between the RCM C2041a-19, circuit 608 (BK/YE), harness side and ground.
- Is the air bag warning indicator off?
1. YES : INSTALL a new RCM. REFER to Restraints Control Module (RCM) . Go to A5.
2. NO : INSTALL a new IC module. REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES . Go to A5.
A5 CHECK FOR ADDITIONAL SRS DTCs
- Key in OFF position.
  WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
- Reconnect all SRS components (if previously disconnected).
  - If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
  - If previously directed to deactivate the SRS, reactivate the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Deactivation and Reactivation .
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
- Are any RCM DTCs retrieved indicating a fault?
1. YES : Do not clear any DTCs until all DTCs have been resolved. Go to the Supplemental Restraint System (SRS) DTC Chart for pinpoint test direction.
2. NO : CLEAR all RCM continuous memory DTCs. PROVE OUT the SRS. Repair is complete. RETURN the vehicle to the customer.