2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. If diagnostic system check was performed, go to next step. If diagnostic system check was not performed, go to ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK  under ON-VEHICLE TESTING.
  2. Remove rear window defogger relay from right instrument panel accessory wiring junction block. Turn ignition switch to RUN position. Connect a test light between ground and rear window defogger relay control circuit terminal N3. See WIRING DIAGRAMS  for appropriate REAR WINDOW & MIRROR DEFOGGERS article. Using scan tool, command rear window defogger relay ON and OFF. If test light does not turn on and off as commanded, go to next step. If test light turns on and off as commanded, diagnose intermittent concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Check for short to ground in control circuit (Orange wire) between right instrument panel accessory wiring junction block harness connector C1 terminal D11 and BCM harness connector C2 terminal B8. See Fig 1 . Repair as necessary. After repair, go to step  6 .
  4. Check for poor terminal contact at BCM harness connector C2. Repair as necessary. If terminals are okay, go to next step. After repair, go to step  6 .
  5. Replace BCM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After programming BCM, go to next step.
  6. Using scan tool, clear DTCs. Operate vehicle within conditions that caused DTC. If DTC B1507 resets, go to step  2 . If DTC B1507 does not exist, system is okay at this time.
Fig 1: Identifying Left/Right instrument panel Accessory Wiring Junction Block Harness Connector
G00009286Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.