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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC B2600: DAYTIME RUNNING LIGHT (DRL) CIRCUIT MALFUNCTIONTESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4

DTC B2600: Daytime Running Light (DRL) Circuit Malfunction: Testing

1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Testing
WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If circuit is shorted to ground, fuse will blow. Check fuse before performing diagnostics.
  1. Perform DAYTIME RUNNING LIGHT DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS. Go to next step.
  2. Inspect the HTR-A/C IGN fuse (10-amp) located in underhood junction block. If HTR-A/C IGN fuse is blown, go to step  8 . If HTR-A/C IGN fuse is ok, go to next step.
  3. Inspect the RH HDLP fuse (15-amp) located in underhood junction block. If RH HDLP fuse is blown, go to step  10 . If RH HDLP fuse is ok, go to next step.
  4. Install a scan tool. Turn ON the ignition, with the engine OFF. Using the scan tool, command the DRL relay ON and OFF. If the DRL relay turns ON and OFF with each command, go to step  12 . If the DRL relay does not turn ON and OFF with each command, go to next step.
  5. Turn OFF the ignition. Disconnect the DRL relay located in underhood junction block. Turn ON the ignition, with the engine OFF. Backprobe the coil side feed circuit of the DRL relay with a test light that is connected to a good ground. See HEADLIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If test light illuminates, go to next step. If test light does not illuminate, go to step  17 .
  6. Connect a test light between the control circuit of the DRL relay connector and the coil side feed circuit of the DRL relay connector. See HEADLIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Using a scan tool, command the DRL relay ON and OFF. If the test light turns ON and OFF with each command, go to step  18 . If the test light does not turn ON and OFF with each command, go to next step.
  7. Test the control circuit of the DRL relay for an open. See HEADLIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. After repair, go to step  20 . If DRL relay control circuit tests ok, go to step  15 .
  8. Test the coil side feed circuit of the DRL relay for a short to ground. See HEADLIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. After repair, go to step  20 . If DRL relay coil side feed circuit tests ok, go to next step.
  9. Replace the HTR-A/C IGN fuse. After repair, go to step  20 .
  10. Test right headlight feed circuit for a short to ground. See HEADLIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. After repair, go to step  20 . If right headlight feed circuit tests ok, go to next step.
  11. Replace the RH HDLP fuse. After repair, go to step  20 .
  12. Test the ground circuit of the DRL relay for an open. See HEADLIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. After repair, go to step  20 . If DRL ground circuit tests ok, go to next step.
  13. Check Dark Blue wire between DRL relay and left headlight for an open. Repair as necessary. After repair, go to step  20 . If Dark Blue wire tests ok, go to next step.
  14. Check for an open in Pink wire between left headlight and underhood junction block. On Grand Am, also check for an open in Dark Blue wire between left headlight terminal "D" and underhood junction block. On all models, repair as necessary. After repair, go to step  20 . If wiring tests ok, go to next step.
  15. Inspect for poor connections at the harness connector of the Body Control Module (BCM). Repair as necessary. After repair, go to step  20 . If BCM connections test ok, go to next step.
  16. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, go to step  20 .
  17. Repair the coil side feed circuit of the DRL relay. After repair, go to step  20 .
  18. Inspect for poor connections at the DRL relay. Repair as necessary. After repair, go to step  20 . If DRL relay connections test ok, go to next step.
  19. Replace DRL relay. After repair, go to next step.
  20. Use the scan tool in order to clear the DTCs. Operate the vehicle within the CONDITIONS FOR RUNNING THE DTC  . If DTC resets, go to step  2 .
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