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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag System >> Diagnostic Tests >> Test AF: No Communication With RCM >> Possible Causes

Possible Causes

No communication with RCM condition could be caused by damaged Light Blue/White wire, damaged DLC, damaged scan tool or RCM internal fault.

  1. Check RCM connector & pin for damage

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect harness connector C2041A. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Inspect RCM connector, terminal No. 5 (Light Blue/White wire), component side and harness side, for damage. See Figure & Figure . If module pin and module harness connector C2041A, terminal No. 5 are okay, go to next step. If module pin and module harness connector C2041A, terminal No. 5 are damaged, repair/replace as necessary. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.

  2. Check DLC for damage

    Inspect Data Link Connector (DLC) and DLC connector terminal No. 7 (Light Blue/White wire) for damage. See Fig 1 . DLC is located under center of instrument panel. If DLC connector and DLC connector terminal No. 7 (Light Blue/White wire) is okay, go to next step. If DLC connector and DLC connector terminal No. 7 (Light Blue/White wire) is damaged, repair/replace Light Blue/White wire or connector as necessary. See WIRING DIAGRAMS  . Reactivate air bag system.

  3. Check circuit for short to battery

    Measure voltage on Light Blue/White wire between ground and DLC connector terminal No. 7. If measurable voltage is detected, repair short to battery on Light Blue/White wire. Reactivate air bag system. If measurable voltage is not detected, go to next step.

  4. Check circuit for open

    Measure resistance of Light Blue/White wire (circuit No. 70) between RCM connector C2041A, terminal No. 5 and DLC connector terminal No. 7. See Figure & Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Light Blue/White wire. Reactivate air bag system.

  5. Check circuit for short to ground

    Measure resistance on Light Blue/White wire between ground and DLC connector terminal No. 7. If resistance is less than 10 k/ohms, repair short to ground on Light Blue/White wire. Reactivate air bag system. If resistance is more than 10 k/ohms, replace RCM. Reactivate air bag system.
Fig 1: Identifying Data Link Connector (DLC)
G98H08170Courtesy of MAZDA MOTORS CORP.
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