B0021:2B

PINPOINT TEST 28: DTCs B0001:2B, B0002:2B, B0010:2B, B0011:2B, B0020:2B, B0021:2B, B0028:2B, B0029:2B, B0050:2B, B0052:2B, B00B5:2B, B1211:2B, B1212:2B, B1213:2B AND B1214:2B

Normal Operation

The Restraints Control Module (RCM) monitors air bag, air curtain/canopy, seatbelt sensor, seat track sensor and safety belt pretensioner circuits for a signal cross coupled (short) between circuits. If the RCM detects a short between the circuits of one device and another device, it will store a DTC for each of the signal cross coupled faults in memory and send a message to the Instrument Cluster (IC) to illuminate the air bag warning indicator. When a normal loop fault is present (one loop is either shorted to battery/ground, has an open circuit or has low resistance), then signal cross coupled diagnostics will not be active. Once the normal loop fault is repaired, then the signal cross coupled diagnostics will resume.

B00B5:2B-B1214:2B:

Possible Causes
- Wiring, terminals or connectors
- RCM

Diagnostic Procedure

WARNING:Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the safety canopy and cause serious personal injury or death.

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.

CAUTION:Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

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

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Chart 1