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AutoCodes - Generic - B2563

B2563 Code - Auxiliary Blower Motor Speed Relay 2 Circuit Short To Voltage

- Code Popularity: 4,755 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B2563?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Auxiliary Blower Motor Speed Relay 2
  • Auxiliary Blower Motor Speed Relay 2 harness is open or shorted
  • Auxiliary Blower Motor Speed Relay 2 circuit poor electrical connection
  • Faulty Blower Motor Resistor
  • Faulty Smart Junction Box (SJB)
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How to Fix the DTC B2563?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2563 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B2563 Description

Under normal operation, ground for the blower motor is provided through the circuit from the blower motor resistor (LO and MED-LO) and the blower motor speed relay 1 (MED-HI and HI). The blower resistor is grounded through the circuit. The blower motor speed relay coils are supplied through the circuit. Blower motor speed is received by the SJB from the rear auxiliary control through the circuit. Reference voltage for the blower speed selector resistor is provided by the SJB through the circuit. The auxiliary blower motor relay coil receives ground from the Smart Junction Box (SJB) through the circuit if any blower switch position but OFF is selected.
In LO, ground for the blower motor is provided through the blower motor resistor.
In MED-LO, blower motor speed relay 2 is grounded by the SJB through the circuit. Blower motor ground circuit is connected through one half of the blower motor resistor to the circuit. The circuit is connected through the blower motor speed relay 2 to the blower motor resistor ground circuit.
In MED-HI, blower motor speed relay 1 is grounded by the SJB through the circuit. Blower motor ground circuit is connected through blower motor speed relay 2 to the circuit. The circuit is connected through one half of the blower motor resistor to the blower motor resistor ground circuit.
In HI, blower motor speed relays 1 and 2 are grounded by the SJB through the circuit. Blower motor ground circuit 515 (OG/RD) is connected through the blower motor speed relay 1 to the circuit. The circuit is connected through the blower motor speed relay 2 to the blower motor resistor ground circuit.

OBDII Code B2563 - Auxiliary Blower Motor Speed Relay 2 Circuit Short To Voltage - AutoCodes.com
B2563 Code - Auxiliary Blower Motor Speed Relay 2 Circuit Short To Voltage

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