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7B-52 Air Conditioning System: DTC B1551: Serial Communication Circuit Malfunction S6JB0B7204024 Wiring Diagram DTC Detecting Condition and Trouble Area DTC Confirmation Procedure 1) Connect scan tool to DLC with ignition switch turned OFF. DTC Troubleshooting 5V G52-10 G30-5 YEL/RED [A] 2 1 3 10 I5JB0A720029-01 [A]: HVAC control module connector “G52” (harness side view) 2. BCM 1. HVAC control module 3. Information display DTC detecting condition Trouble area Serial communication signal is more than or less than specified value for • Serial communication line of BCM Step Action Yes No 1 DTC check OFF. 2) Turn ignition switch ON and clear DTC referring to “DTC 3) Disconnect connector from information display with ignition switch turned OFF. 4) Turn ignition switch ON and check DTC referring to Is there DTC B1551? Go to Step 2. Information display 2 Wire harness check module. 2) Measure resistance between “G30-5” terminal of BCM connector and “G52-10” terminal of HVAC control Is resistance below 5 Ω ? Go to Step 3. “YEL/RED” wire open or 3 Wire harness check control module connector and vehicle body ground. Is resistance infinity? Go to Step 4. “YEL/RED” wire shorted |