B2562

Code

Other B — Body

Aux A/C Blower Speed 1 Circuit Short to Ground

Brand: Other

Type: B — Body

Views: UK: 23 EN: 187 RU: 104

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Damaged wiring harness (chafing, pinched, cut) causing conductor contact with chassis ground
Corroded or pushed-out connector pins making unintended ground connection
Failed blower motor resistor or blower control module with internal short to ground
Water intrusion into blower motor or connector causing shorting
Aftermarket accessory or incorrect previous repair introduced a short to ground
Faulty A/C/BCM/control module (less common)

Retrieve stored codes and freeze frame, note conditions when code set
Visual inspection of blower motor, resistor/module, wiring harness and connectors for damage, corrosion, or water intrusion
Check related fuses and fusible links for open or signs of overheating
With ignition off, inspect connector pins for pushed-out or bridged terminals
Measure resistance/continuity between the suspect circuit and chassis ground with harness disconnected (should not be near 0 ohms)
Probe the circuit with a DVOM or test lamp while cycling blower speeds to observe presence of voltage or PWM and to see if short appears under load

Expected control voltage range: 0–12 V (0 V = off, ~12 V or PWM duty = high speed)
PWM control: duty cycle varies with selected blower speed (frequency varies by manufacturer)
Current draw: blower circuits can draw several amps; high currents may cause fuse/fusible link operation (use an appropriate ammeter or clamp meter)

Confirm B2562 stored and note operating conditions (ignition on, A/C enabled, speed selection)
Inspect fuses and fusible links; replace open fuse only after finding/repairing short
Perform a visual inspection of external wiring, connectors at the auxiliary blower, resistor/module and ground points for damage or corrosion
Disconnect auxiliary blower/resistor connector. With ignition off, measure continuity between the blower speed 1 circuit and chassis ground. Near-zero ohms indicates a short to ground; open/very high resistance indicates no short in harness to that point
If short present with connector disconnected, trace back wiring harness and remove panels to visually locate chafe points. Repair/insulate/replace damaged wiring and connectors
If no short with connector disconnected, bench test the blower motor and resistor/module by applying proper voltage via fused jumper or test bench equipment; replace the component if it shows internal short or abnormal current draw
If component tests good, check the A/C/blower control module outputs. Probe output while operating blower: expect 0–12 V or a PWM signal. If output is stuck to ground and wiring is good, suspect control module fault
After repairs, clear codes, reinstall components, verify blower operation at all speeds and confirm code does not return
If intermittent, perform wiggle tests and road test to reproduce conditions; re-inspect any areas that move or flex