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Home >> GMC >> 1999 >> Jimmy 4D Utility, 4WD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> Diagnostic Tests >> DTC B2618: Courtesy Light Circuit High >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS. After performing system check, go to next step.
  2. Turn ignition on. Open a door. Remove courtesy light relay from Body Bussed Electrical Center (BBEC). See COMPONENT LOCATIONS  . Connect scan tool to Data Link Connector (DLC). Turn ignition on. Monitor current DTCs on scan tool. If scan tool displays DTC B2618 as a current code, go to next step. If scan tool does not display DTC B2618 as a current code, go to step 5).
  3. Turn ignition off. Disconnect Light Blue 24-pin BCM connector. See COMPONENT LOCATIONS  . Turn ignition on. Monitor current DTCs on scan tool. If scan tool displays DTC B2618 as a current code, go to next step. If scan tool does not display DTC B2618 as a current code, go to step 6).
  4. Repair short to battery voltage in Gray/Black wire between Light Blue 24-pin BCM connector terminal A3 and courtesy light relay. See WIRING DIAGRAMS  . After repair, go to step 7).
  5. Replace courtesy light relay. After replacing relay, go to step 7).
  6. Replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. Program BCM and perform relearn procedure. See PROGRAMMING  . After programming module, go to step 12)  .
  7. Clear DTCs. After clearing DTCs, perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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