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Axle Locker Control Diagnosis

If the problem being diagnosed involves a rear or front lock indicator in the instrument cluster that is blinking on and off, be certain to complete inspection of the appropriate front or rear axle locker relays, locker pumps, pneumatic lines, locker indicator switches, and axle locker mechanisms before performing the following tests. If the problem being diagnosed involves a rear or front lock indicator in the instrument cluster that stays on when it should be off, or stays off when it should be on, complete the testing of the axle locker switch before performing the following tests.

These tests will establish the integrity of the hard wired circuits related to the axle locker control function of the instrument cluster. However, proper testing of the instrument cluster programming and the electronic vehicle speed and transfer case shift position messages received by the cluster over the PCI data bus requires the use of a DRBIII(R) scan tool. Refer to the appropriate diagnostic information. Refer to the appropriate wiring information in ELECTRICAL. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, DRIVER AIRBAG, PASSENGER AIRBAG, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
  1. Disconnect and isolate the battery negative cable. Remove the rear and front axle locker relays from their receptacles in the Power Distribution Center (PDC). Remove the axle lock switch from the instrument panel. Disconnect the instrument panel wire harness connector for the axle lock switch from the switch connector receptacle. Remove the instrument cluster from the instrument panel.
  2. Check for continuity between each of the rear and front axle lock request circuit cavities of the appropriate instrument panel wire harness connectors (Connector C1 for rear, Connector C2 for front) for the instrument cluster and a good ground. There should be no continuity. If OK, go to step  3. If not OK, repair the shorted rear or front axle lock request circuit between the instrument cluster, the axle lock switch, and the rear or front axle locker relay as required.
  3. Check for continuity between each of the rear and/or front axle lock request circuit cavities of the instrument panel wire harness connectors (Connector C1 for rear, Connector C2 for front) for the instrument cluster, the instrument panel wire harness connector for the axle lock switch, and the rear or front axle locker relay receptacle in the PDC. In each case, there should be continuity. If OK, go to step  4. If not OK, repair the open rear and/or front axle lock request circuit between the instrument cluster, the axle lock switch, and the PDC as required.
  4. Check for continuity between the axle lock switch enable 1 and/or enable 2 circuit cavity of the instrument panel wire harness connector (Connector C1 for enable 1, Connector C2 for enable 2) for the instrument cluster and a good ground. There should be no continuity. If OK, go to step  5. If not OK, repair the shorted axle lock switch enable 1 or enable 2 circuit between the instrument cluster and the axle lock switch as required.
  5. Check for continuity between the axle lock switch enable 1 and/or enable 2 circuit cavities of the instrument panel wire harness connector (Connector C1 for enable 1, Connector C2 for enable 2) for the instrument cluster and the instrument panel wire harness connector for the axle lock switch. There should be continuity. If OK, go to step  6. If not OK, repair the open axle lock switch enable 1 or enable 2 circuit between the instrument cluster and the axle lock switch as required.
  6. Disconnect the rear and/or front locker indicator switch pigtail harness connector from the rear or front axle jumper harness connector. Check for continuity between the ground circuit cavity of the rear or front axle jumper harness connector and a good ground. There should be continuity. If OK, go to step  7. If not OK, repair the open ground circuit between the rear or front axle jumper harness connector for the rear or front locker indicator switch and ground (G105) as required.
  7. Check for continuity between the ground circuit and the rear or front locker indicator switch sense circuit cavities of the rear or front locker indicator switch pigtail harness connector. There should be continuity with the axle locker engaged, and no continuity with the axle locker disengaged. If OK, go to step  8. If not OK, replace the faulty rear or front locker indicator switch.
  8. Check for continuity between the rear or front locker indicator switch sense circuit cavity of the rear or front axle jumper harness connector for the locker indicator switch and a good ground. There should be no continuity. If OK, go to step  9. If not OK, repair the shorted rear or front locker indicator switch sense circuit between the rear or front axle jumper harness connector for the locker indicator switch and the instrument cluster as required.
  9. Check for continuity between the rear or front locker indicator switch sense circuit cavities of the rear or front axle jumper harness connector for the locker indicator switch and the instrument cluster. There should be continuity. If OK, use a DRBIII(R) scan tool to perform additional testing of the instrument cluster. Refer to the appropriate diagnostic information. If not OK, repair the open rear or front locker indicator switch sense circuit between the rear or front axle jumper harness connector for the locker indicator switch and the instrument cluster as required.
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