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Bus +/- Signals Open From RKE

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS. Unless instructed otherwise in test step, reconnect any disconnected connectors.
  1. Turn ignition off. Remove and inspect fuse No. 16 (RKE) from fuse block. If fuse is open, go to next step. If fuse is okay, reinstall fuse and go to step  4.
  2. Using an ohmmeter, check resistance between ground and RKE module connector terminal No. 9, fused B+ circuit (Red/Black wire). See Fig 1. If resistance is less than 10 ohms, leave fuse removed and go to next step. If resistance is 10 ohms or more, replace fuse No. 16.
    Fig 1: Identifying Remote Keyless Entry (RKE) Module Connector Terminals
    G00012692Courtesy of DAIMLERCHRYSLER CORP.
  3. Ensure ignition is off. Disconnect RKE module connector. Using ohmmeter, check resistance between ground and RKE module connector terminal No. 9, fused B+ circuit (Red/Black wire). If resistance is less than 10 ohms, repair Red/Black wire for short to ground and replace fuse No. 16. If resistance is 10 ohms or more, replace fuse No. 16 and RKE module. See REMOTE KEYLESS ENTRY (RKE) MODULE  under REMOVAL & INSTALLATION.
  4. Remove and inspect fuse No. 11 from fuse block. If fuse is open, leave fuse removed and go to next step. If fuse is okay, reinstall fuse and go to step  7.
  5. Using an ohmmeter, check resistance of fused ignition switch output start/run circuit (Dark Blue/White wire) between ground and fuse No. 11 connector. If resistance is less than 10 ohms, leave fuse removed and go to next step. If resistance is 10 ohms or more, replace fuse No. 11.
  6. Ensure ignition is off. Disconnect RKE module connector. Using an ohmmeter, check resistance between ground and RKE module connector terminal No. 22, fused ignition switch output start/run circuit (Dark Blue/White wire). If resistance is less than 10 ohms, repair Dark Blue/White wire for short to ground and replace fuse No. 11. If resistance is 10 ohms or more, replace fuse No. 11 and RKE module. See REMOTE KEYLESS ENTRY (RKE) MODULE  under REMOVAL & INSTALLATION.
  7. Ensure ignition is off. Disconnect RKE module connector. Turn ignition on. Using a voltmeter, check voltage on RKE module connector terminal No. 22, fused ignition switch output start/run circuit (Dark Blue/White wire). If voltage is more than 10 volts, leave RKE module connector disconnected and go to next step. If voltage is 10 volts or less, leave RKE module connector disconnected and go to step  9.
  8. Turn ignition off. Using an ohmmeter, check resistance between ground and RKE module connector terminal No. 12, ground circuit (Black wire). If resistance is less than 5 ohms, leave RKE module connector disconnected and go to step  11. If resistance is 5 ohms or more, repair open Black wire.
  9. Turn ignition off. Using an ohmmeter, check resistance between ground and RKE module connector terminal No. 12, ground circuit (Black wire). If resistance is less than 5 ohms, leave RKE module connector disconnected and go to next step. If resistance is 5 ohms or more, repair open Black wire.
  10. Ensure ignition is off. Remove fuse No. 11 from fuse block. Using ohmmeter, check resistance of fused ignition switch output start/run circuit (Dark Blue/White wire) between RKE module connector terminal No. 22 and fuse No. 11 connector. If resistance is less than 5 ohms, leave RKE module connector disconnected and go to next step. If resistance is 5 ohms or more, repair open Dark Blue/White wire.
  11. Turn ignition on. Using a voltmeter, check voltage on RKE module connector terminal No. 9, fused B+ circuit (Red/Black wire). Record voltage reading. Leave RKE module connector disconnected and go to next step.
  12. Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located on bottom of instrument panel, to left of brake pedal. See Figure. Turn ignition on. Using scan tool, attempt to communicate with other modules. If scan tool does not communicate with other modules, proceed to COMPLETE PCI BUS FAILURE  test. If scan tool communicates with other modules, go to next step.
  13. Connect Scope Input Cable (CH7058) to channel one connector on scan tool. Connect Red and Black leads and Cable-to-Probe Adapter (CH7062) to scope input cable. Go to next step.
  14. Using scan tool, select DRB STANDALONE, LAB SCOPE, LIVE, then 12-VOLT SQUARE WAVE. Press F2 for scope. Press F2 again and use down arrow to set voltage range to 20 volts. Press F2 again. Go to next step.
  15. Connect Black lead to ground. Connect Red lead to RKE module connector terminal No. 19, PCI bus circuit (Violet/Yellow wire). Turn ignition on. Observe voltage display on scan tool lab scope. If voltage pulses from zero to about 7.5 volts and voltage reading in step  11 was more than 10 volts, replace RKE module. See REMOTE KEYLESS ENTRY (RKE) MODULE  under REMOVAL & INSTALLATION. If voltage pulses from zero to 7.5 volts and voltage reading in step  11 was 10 volts or less, leave RKE module connector disconnected and go to next step. If voltage remains at zero volts, repair open Violet/Yellow wire.
  16. Remove fuse No. 16 from fuse block. Using an ohmmeter, check resistance of fused B+ circuit (Red/Black wire) between RKE module connector terminal No. 9 and fuse No. 16 connector. If resistance is less than 5 ohms, replace RKE module. See REMOTE KEYLESS ENTRY (RKE) MODULE  under REMOVAL & INSTALLATION. If resistance is 5 ohms or more, repair open Red/Black wire.
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