Windshield Wiper Test 14A - Rear Wiper MUX Circuit Error

NOTE: Perform WINDSHIELD WIPER TEST 1A before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagrams, refer to WIRING DIAGRAMS . Perform, after each repair, VERIFICATION TEST VER-1A - VERIFICATION PROCEDURE .

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

Erase trouble code. Turn ignition on. Operate rear wiper for one minute (minimum). Using scan tool read DTCs (fault messages). If rear wiper MUX circuit error code is present, go to next step. If code is not present, system is currently functioning correctly.
Disconnect Heater, Ventilation and Air Conditioning (HVAC) control module 21-pin Blue connector (integral with instrument panel control). Using scan tool in ohmmeter mode, measure resistance at terminal No. 21 (Black/Light Green wire) on HVAC connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Black/Light Green wire.
Using scan tool, monitor rear wiper switch voltage. If scan tool displays 5 volts, repair Yellow/White wire between Body Control Module (BCM) terminal No. 38 and HVAC Blue connector, terminal No. 2 for short to battery voltage. If scan tool does not display 5 volts, replace BCM. BCM is located with junction block under driver's side instrument panel. See Figure .