B0503 CADILLAC - Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit
B0503 CADILLAC Possible Causes
- Faulty Right Daylight Running Lamp (DRL) Relay
- Right Daylight Running Lamp (DRL) Relay harness is open or shorted
- Right Daylight Running Lamp (DRL) Relay circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B0503 CADILLACCheck 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.
Cost of diagnosing the B0503 CADILLAC code
Labor: 1.0The cost of diagnosing the B0503 CADILLAC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
B0503 CADILLAC MeaningThe Body Control Module (BCM) provides control for the Right Daylight Running Lamp (DRL) relay circuit. The BCM grounds the RH DRL relay control circuit in order to energize the RH DRL relay and turn ON the RF turn signal. This allows the RF turn signal to be used for DRL and approach lighting functions. The BCM monitors the voltage level on the RH DRL relay control circuit. When the BCM commands the relay ON, the voltage level on the RH DRL relay control circuit should be low. When the relay is OFF, the voltage on the RH DRL relay control circuit should be high. If the BCM detects a voltage level other than expected, a malfunction is present and a Diagnostic Trouble Code (DTC) will set.
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