B1969

Code

Other B — Body

A/C Clutch Magnetic Control Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 21 EN: 40 RU: 37

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Retrieve freeze-frame and related codes/livedata with a scan tool; note conditions when fault set
Visually inspect clutch connector, wiring harness, fuses and A/C clutch relay for damage or corrosion
Check battery voltage and charging system under engine off and running conditions
Measure voltage at the clutch connector with ignition ON and A/C commanded ON (and during attempted engagement)
Measure clutch coil resistance at the connector (with connector unplugged) and compare to spec
Check continuity to ground and continuity to the controlling relay/module pin

Supply voltage at clutch connector when commanded: approx. battery voltage (~11–14.5 V) (vehicle-dependent)
Clutch coil resistance (typical range): ~2–10 Ω (manufacturer-specific — consult spec)
Control signal type: switched 12V or switched ground or PWM drive (consult vehicle wiring)
Clutch engagement current draw: commonly several amps (use clamp meter to verify)
No voltage or intermittent voltage when A/C requested indicates wiring/relay/module issue

Verify the code and note conditions (engine speed, vehicle voltage, A/C request) using a scan tool.
Perform a visual inspection of the compressor clutch connector, wiring, fuses and A/C clutch relay for damage, corrosion or loose pins.
With ignition ON and A/C requested, measure voltage at the clutch connector while someone cycles the A/C; confirm proper supply or control signal present.
Unplug connector and measure coil resistance across clutch coil terminals; compare to vehicle spec. An open or very high resistance indicates a bad coil.
Check continuity of the control and ground circuits back to the module/relay; repair any open or high-resistance wiring or corroded connectors.
Bench-test or apply known-good 12 V to the clutch coil (observe current draw) to verify clutch acts and to check for excessive current or no response.
If wiring, relay and clutch coil test good, verify control module output with a scope or multimeter (observe PWM or switched signal) and compare with expected behavior; consider module fault if output missing or erratic.
Repair or replace failed component(s), clear codes and re-test under the same conditions to confirm proper operation and that the code does not return.