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DTC B2470: Daytime Running Lights Fault: Testing

  1. If lighting system diagnostic system check has been performed, go to next step. If lighting system has not been performed, go to LIGHTING SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Remove DRL relay. Relay is located in the underhood relay center. See Figure . Turn ignition on. Using DVOM, measure voltage between ground and DRL relay connector terminal A9 (Pink wire). See HEADLIGHT SYSTEMS & DAYTIME RUNNING LIGHTS article. If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step  5 .
  3. Install DRL relay. Disconnect PZM connector C2. See Figure . Connect fused jumper between PZM connector C2 terminal D5 (Light Gray/Black wire) and ground. See Figure . If Daytime Running Lights (DRL) turn on, go to next step. If DRL do not turn on, go to step  6 .
  4. Replace PZM. See PLATFORM ZONE MODULE (PZM)  under REMOVAL & INSTALLATION. After repairs, go to step  9 .
  5. Repair open or short to ground in Pink wire between underhood fuse block and underhood relay center. After repairs, go to step  9 .
  6. Check for open in Light Gray/Black wire between PZM and underhood relay center. If circuit is okay, go to next step. If faulty circuit is found, go to step  8 .
  7. Replace DRL relay. After repairs, go to step  9 .
  8. Repair open in Light Gray/Black wire. After repairs, go to next step.
  9. Use scan tool to clear DTCs. Recheck system operation. Recheck for DTCs. If DTC resets, go to step  2 . If DTC does not reset, repair is complete.
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