Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost to diagnose the B113A code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The Rear Audio and Temperature Control (RATC) Module receives voltage and ground through the circuit. The RATC module receives input from the rear auxiliary audio controls through the circuit. It then sends these signals to the audio unit over the Audio Corporate Protocol (ACP) network through circuits. The RATC module sets the OBDII code when a rear auxiliary audio control switch is detected active for greater than 120 seconds during normal operation, or for greater than 2 seconds during the self-test.
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