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Test C: Power Mode Mismatch

NOTE: Open driver's door and leave it open during testing. The RAP power mode will be disabled and removed from power mode parameter list.

Normal vehicle class 2 communications and module operations will not begin until system power mode has been identified. In order to determine correct power mode, wires from ignition switch contacts are monitored by the Dash Integration Module (DIM) module designated the Power Mode Master (PMM). DIM communicates the system power mode to all class 2 modules on class 2 serial data line.

  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, go to next step. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, go to step  6.
  2. Turn ignition switch to UNLOCK position. Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, go to next step. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, go to step  6.
  3. Turn ignition on. Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, go to next step. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, go to step  6.
  4. Turn ignition switch to START position. Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, go to next step. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, go to step  6.
  5. Turn ignition switch to ACCY position. Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, check for loose wires and poor connections between ignition switch and DIM. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, go to next step.
  6. Turn ignition off. Disconnect DIM harness connector. Hold ignition switch in the position that indicated incorrect power mode. Connect a test light to ground and probe ignition switch terminals No. 5 (Orange wire) for voltage in RUN position, No. 7 (Pink wire) for voltage in START position, No. 8 (Brown wire) for voltage in ACCY position and No. 10 (White wire) for voltage in OFF/RUN/START positions. If voltage is present on only the terminals specified by ignition switch position, go to next step. If voltage is not present on terminals not specified by ignition switch position, go to step  8.
  7. Hold ignition switch to position that indicated wrong power mode. Connect test light to ground and probe DIM harness connector C3 terminals A1 (White wire) for voltage in OFF/RUN/START positions, A2 (Brown wire) for voltage in ACCY position, A3 (Pink wire) for voltage in START position and B1 (Orange wire) for voltage in RUN position. If voltage does not exist on any terminals specified to ignition switch position, go to step  9. If voltage exists on all terminals specified by ignition switch position, go to step  11.
  8. Disconnect ignition switch harness connector. Check for short to voltage in White wire between DIM harness connector C3 terminal A1 and ignition switch harness connector terminal No. 10. Check for short to voltage in Brown wire between DIM harness connector C3 terminal A2 and ignition switch harness connector terminal No. 8. Check for short to voltage in Pink wire between DIM harness connector C3 terminal A3 and ignition switch harness connector No. 7. Check for short to voltage in Orange wire between DIM harness connector C2 terminal B1 and ignition switch harness connector terminal No. 5. If no problem was found, go to step  10. If a problem was found and corrected, go to step  14
  9. Disconnect ignition switch harness connector. Check for an open in White wire between DIM harness connector C3 terminal A1 and ignition switch harness connector terminal No. 10. Check for an open in Brown wire between DIM harness connector C3 terminal A2 and ignition switch harness connector terminal No. 8. Check for an open in Pink wire between DIM harness connector C3 terminal A3 and ignition switch harness connector No. 7. Check for an open in Orange wire between DIM harness connector C2 terminal B1 and ignition switch harness connector terminal No. 5. If no problem was found, go to next step. If a problem was found and corrected, go to step  14.
  10. Check for loose wires and poor connections at ignition switch harness connector. If no problem was found, go to step  12. If a problem was found and corrected, go to step  14.
  11. Check for loose wires and poor connections at DIM harness connector. If no problem was found, go to step  13. If a problem was found and corrected, go to step  14.
  12. Replace ignition switch. See IGNITION & KEY ALARM SWITCH ASSEMBLY under REMOVAL & INSTALLATION in STEERING COLUMN SWITCHES - DEVILLE article.
  13. Replace DIM module. See DASH INTEGRATION MODULE  under REMOVAL & INSTALLATION.
  14. Reconnect all disconnected components. Connect scan tool to DLC. Cycle ignition switch through all positions. Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, system is okay at this time. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, return to step  1.
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