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Diagnostic Procedures

  1. If learn procedure has been performed on BCM, go to next step. If learn procedure has not been performed on BCM, perform appropriate learn procedure. See PROGRAMMING .
  2. Turn ignition switch to OFF position. Connect scan tool. Turn parking lights on to maintain BCM awake state. Using scan tool, monitor Passlock™ power feedback while cycling ignition switch from ON to OFF position. Turn parking lights off. If Passlock™ power feedback does not follow ignition, go to next step. If Passlock™ power feedback follows ignition, go to step  5.
  3. Disconnect Passlock™ sensor. If feedback voltage is high, replace Passlock™ sensor. See REMOVAL & INSTALLATION in appropriate STEERING COLUMN SWITCHES article. If feedback voltage is not high, go to next step.
  4. Using a DVOM, measure voltage between Passlock™ sensor connector terminal "A" (White wire) and ground. If voltage is more than 10 volts, replace BCM. See REMOVAL & INSTALLATION in appropriate BODY CONTROL MODULES article. If voltage is 10 volts or less, repair White wire for short to Black wire (sensor return circuit), or chassis ground. See WIRING DIAGRAMS.
  5. Turn ignition switch to ON position. Using scan tool, monitor Passlock™ voltage. If voltage is less than .4 volt, go to next step. If voltage is more than 4.3 volts, go to step  8. If voltage is .4-4.3 volts, problem is intermittent. See DIAGNOSTIC AIDS .
  6. Disconnect Passlock™ sensor connector. If voltage is 4.3 volts or less, go to next step. If voltage is more than 4.3 volts, replace Passlock™ sensor. See REMOVAL & INSTALLATION in appropriate STEERING COLUMN SWITCHES article.
  7. Disconnect BCM connectors J2 and J3. Using a DVOM, check for continuity between Yellow wire and ground, and between Yellow wire and Black wire (sensor return circuit). If continuity exists, repair short to ground or short to Black wire. If no continuity exists, replace BCM. See REMOVAL & INSTALLATION in appropriate BODY CONTROL MODULES article.
  8. Disconnect Passlock™ sensor connector. Connect a jumper wire between Passlock™ sensor harness connector terminals "C" (Yellow wire) and "B" (Black wire). If voltage is .4 volt or more, go to next step. If voltage is less than .4 volt, go to step  10.
  9. Disconnect jumper wire. Using a DVOM, measure voltage between ground and Passlock™ sensor harness connector terminal "C" (Yellow wire). If voltage is 4-6 volts, repair open in Black wire (sensor return circuit) between Passlock™ sensor and BCM. If voltage is not 4-6, repair open in Yellow wire between Passlock™ sensor and BCM. See WIRING DIAGRAMS .
  10. Disconnect jumper wire. Using a DVOM, measure voltage between ground and Passlock™ sensor harness connector terminal "A" (White wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step  12.
  11. Using a DVOM, measure voltage between ground and Passlock™ sensor connector terminal "C" (Yellow wire). If voltage is not 4-6 volts, repair Yellow wire for short to voltage or short to White wire (sensor power circuit). If voltage is 4-6 volts, check connector at Passlock™ sensor. If connector is okay, replace Passlock™ sensor. See REMOVAL & INSTALLATION in appropriate STEERING COLUMN SWITCHES article.
  12. Turn ignition switch to OFF position. Disconnect BCM connector J3. Using a DVOM, check for continuity between ground and Passlock™ sensor harness connector terminal "A" (White wire). If continuity exists, repair White wire for short to ground. If continuity does not exist, check for open in White wire or for loose connector at BCM. If wire and connector are okay, replace BCM. See REMOVAL & INSTALLATION in appropriate BODY CONTROL MODULES article.
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