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10-14 volts. A lower voltage reading indicates a poor (3) Connect the negative lead of voltmeter to a good body ground point. The voltage reading should (4) Connect negative lead of voltmeter to ground terminal and touch each grid line at Mid-Point with HVAC CONTROL MODULE The control switch and timer circuit may be tested in the vehicle with or without the DRB lll t scan tool. TESTING WITH DRB lll t SCAN TOOL If using the DRB lll t scan tool, refer to the proper Body Diagnostic Procedures Manual. TESTING WITHOUT DRB lll t SCAN TOOL (1) Remove the control switch from console and do not disconnect control switch (Fig. 4). (2) Using a ohmmeter, check leads between Pins 5 and 8 of the 8-way connector. Depress the rear win- • Rear window relay (EBL) • Blown fuse • Cut wire • Poor ground • Poor connection • Defective BCM • Bulkhead connector inoperative REAR WINDOW DEFOGGER RELAY (1) Check fuses. (a) Fuse 15 in the Junction Block Center. from the Junction Block (Fig. 5). (3) Using voltmeter, test battery voltage: (a) Test rear window defogger relay terminals 13 for battery voltage. If voltage is OK, go to Step b. If (b) Test the rear window defogger relay terminal for battery voltage with the key in the run posi- (c) Use a known good relay. If not OK, repair cir- cuits as necessary. Refer to Group 8W, Wiring Dia- Fig. 4 HVAC Control Module Connectors Fig. 5 Rear Window Defogger Relay (EBL) 1 – CIRCUIT BREAKERS JX ELECTRICALLY HEATED SYSTEMS 8N - 3 DIAGNOSIS AND TESTING (Continued) |