Diagnostic Routine C

Diagnostic Routine C

Diagnostic Overview

The Restraints Control Module (RCM) Does Not Respond To The Scan Tool

Refer to Wiring Diagram Set 14 for schematic and connector information Electrical Diagrams.

Refer to Wiring Diagram Set 46 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The RCM (Restraints Control Module) communicates with the scan tool through the HS-CAN (High Speed Controller Area Network).

Visual Inspection and Diagnostic Pre-checks

Verify BCM (Body Control Module) fuse 37 (10A) is OK.

Pinpoint Test

1. CHECK THE RCM (Restraints Control Module) CONNECTION

1. Ignition OFF.

2. Depower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

3. Disconnect: RCM (Restraints Control Module) C310A.

4. Disconnect: RCM (Restraints Control Module) C310B.

Are RCM (Restraints Control Module) C310A pin 13 and RCM (Restraints Control Module) C310B pins 9 and 10 OK?






2. CHECK THE RCM (Restraints Control Module) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

1. Repower the SRS. REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

2. Ignition ON.

3. Measure:





Is the voltage greater than 11 volts?






3. CHECK THE RCM (Restraints Control Module) CASE GROUND

1. Ignition OFF.

2. Disconnect: Negative Battery Cable.

3. Measure the resistance between the RCM (Restraints Control Module) case and a good chassis ground.

Is the resistance less than 3 ohms?






4. CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS BETWEEN THE RCM (Restraints Control Module) AND THE DLC (Data Link Connector) FOR AN OPEN

1. Depower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

2. Measure:





Are the resistances less than 3 ohms?






5. CHECK FOR CORRECT RCM (Restraints Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all RCM (Restraints Control Module) connectors.

3. 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 Wiring Diagram Set 5 for schematic and connector information Electrical Diagrams.


4. Reconnect the RCM (Restraints Control Module) connectors. Make sure they seat and latch correctly.

5. Repower the SRS. REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

6. Operate the system and verify the concern is still present.

Is the concern still present?