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(4) The relay coil ground (-) terminal (85) is con- nected to the Body Control Module Q33 circuit and (5) When the Vehicle Theft Security System is armed the BCM opens the ground circuit to the deck DIAGNOSTIC CONDITIONS When trouble shooting problems with the Remote Keyless Entry System, always verify that the power If the following modules do not work: • Body Control Module • Door lock switches trol Module (BCM) battery feed fuse are located in Key fob transmitter will not lock or unlock doors. (1) Check that the BCM has power and ground. fob transmitter batteries for 3 Volts each. If less than (3) If the system still does not work, replace the key fob transmitter. Refer to Programing Remote All doors will not unlock with the key fob (1) Using a voltmeter, check Pin 4 of the BCM 20 Pin connector for a voltage pulse (Fig. 3). Press the (2) If no voltage pulse, replace RKE module. If voltage is measured, repair the harness between the (3) Check Pin 1 of the BCM 20 Pin connector for a quick voltage pulse when the unlock button is (4) If no voltage pulse is measured at Pin 1, replace the BCM. Repair the harness between termi- Driver door will NOT unlock with the key fob (1) Using a voltmeter, check Pin 4 of the BCM 20 Pin connector for a voltage pulse (Fig. 3). Depress the (2) If no voltage pulse is measured, replace the BCM. If voltage is measured repair harness from Driver door will unlock with the key fob (1) Using a voltmeter, check Pin 1 of the BCM 20 Pin connector for a voltage pulse (Fig. 3). Press the (2) If no voltage pulse is measured, replace the BCM. If voltage is measured, repair the harness to Doors do not lock with the key fob transmitter. (1) Using a voltmeter, check Pins 10 and 11 of the BCM 20 Pin connector for a voltage pulse (Fig. 3). (2) If no voltage pulse is measured, replace BCM. If a voltage is measured, repair the Junction Block as Doors will lock with the key fob transmitter but (1) Press horn button, listen horn sound. disabled with the scan tool (DRB). Then check the (3) Using a voltmeter, check horn relay for voltage pulse (Fig. 3). Press the lock button on the key fob (4) If no voltage pulse measured, replace the BCM. If voltage is measured, repair harness to the horn Fig. 3 BCM 20-Way Connector JX POWER LOCK SYSTEMS 8P - 7 DIAGNOSIS AND TESTING (Continued) |