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P1652 Diagnostic Trouble Code Discussion for November 2010

Serial Communication Link Malfunction

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Trouble Ticket Help Requests for DTC P1652
Help Request Posted
1997 Buick Century Custom 3.1L High speed fan inop VIN: 2G4WS5M3V1
P1652: Cooling Fan 2 Relay Control Circuit Malfunction. Backprobed dark green wire at ecm pin 32. Shows ground with fan off and power with fan on this is for low speed. Backprobed dark blue wire at ecm pin 31 nothing no ground or power and no high speed operation. My question is does the power and ground come strai...
November 15, 2010