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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 B2527: Front FOGLIGHT Circuit Low >> 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. Connect scan tool to Data Link Connector (DLC). Disconnect Purple 16-pin BCM connector. See COMPONENT LOCATIONS  . Monitor current DTCs on scan tool. If scan tool displays DTC B2527 as current, go to step 6). If scan tool does not display DTC B2527 as current, go to next step.
  3. Disconnect foglight switch connector. Using test light connected to battery voltage, backprobe foglight switch connector terminal "E" (Orange wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 5).
  4. Repair short to ground in Orange wire between foglight switch connector terminal "E" and Purple 16-pin BCM connector terminal B5. Repair as necessary. After repairs, go to step 7).
  5. Replace front foglight switch. After repairs, 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 next step.
  7. Clear DTCs. After clearing DTCs, perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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