PINPOINT TEST C : The Restraints Control Module Does Not Respond To The Scan Tool
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. REFER to Battery, Mounting and Cables
- C1 CHECK THE RCM CONNECTION
- Ignition OFF.
- Depower the Supplemental Restraint System (SRS). REFER to Supplemental Restraint System - With Intelligent Access or REFER to Supplemental Restraint System - Without Intelligent Access .
- Disconnect: RCM C310A.
- Disconnect: RCM C310B.
Are RCM C310A pin 19 and RCM C310B pins 47 and 48 OK?
Yes GO to C2. No INSTALL a new wiring harness. REPOWER the Supplemental Restraint System (SRS). REFER to Supplemental Restraint System - With Intelligent Access (IA) or REFER to Supplemental Restraint System - Without Intelligent Access (IA) . - C2 CHECK THE RCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Repower the SRS. REFER to Supplemental Restraint System - With Intelligent Access (IA) or REFER to Supplemental Restraint System - Without Intelligent Access (IA) .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C310A-19 Ground
Is the voltage greater than 11 volts?
Yes GO to C3. No VERIFY the BCM fuse 37 (10A) is OK. If OK, REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short. - C3 CHECK THE RCM CASE GROUND
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the RCM case and a good chassis ground.
Is the resistance less than 3 ohms?
Yes GO to C4. No REPAIR the RCM case ground as necessary. CONNECT the negative battery cable. - C4 CHECK THE HS-CAN CIRCUITS BETWEEN THE RCM AND THE DLC FOR AN OPEN
- Depower the Supplemental Restraint System (SRS). REFER to Supplemental Restraint System - With Intelligent Access (IA) or REFER to Supplemental Restraint System - Without Intelligent Access (IA) .
Are the resistances less than 3 ohms?
Yes CONNECT the negative battery cable. GO to C5. No REPAIR the circuit in question. CONNECT the negative battery cable. - C5 CHECK FOR CORRECT RCM OPERATION
- Ignition OFF.
- Disconnect and inspect all RCM connectors and related in-line connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Refer to Connector Repair Procedures for schematic and connector information.
- Reconnect the RCM connectors and related in-line connectors. Make sure they seat and latch correctly.
- Repower the SRS. REFER to Supplemental Restraint System - With Intelligent Access (IA) or REFER to Supplemental Restraint System - Without Intelligent Access (IA) .
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new RCM. REFER to Supplemental Restraint System . No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
