Chart C-12B - Cooling Fan On At All Times (2 Of 4)(3.8L "C" & "H" Bodies)

NOTE: Test numbers refer to test numbers on diagnostic charts.

1. Checks if circuit No. 1269 is shorted to ground, which would keep relay closed at all times.
2. Checks if circuit No. 1270 is shorted to ground. Continue to follow chart to isolate shorted circuit.
3. If test light is off after disconnecting PCM, ensure circuit No. 1269 is not shorted to B+. If circuit is not shorted, PCM is shorted internally.
4. If test light is off after disconnecting PCM, ensure circuit No. 1270 is not shorted to B+. If circuit is not shorted, PCM is shorted internally.

Fig 1: Chart C-12B Schematic (3.8L "C" & "H" Bodies) Cooling Fan Circuit Diagnosis (Cooling Fan On At All Times)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Chart C-12B Flow Chart (2 Of 4)(3.8L "C" & "H" Bodies) Cooling Fan Circuit Diagnosis (Cooling Fan On At All Times)

Courtesy of GENERAL MOTORS CORP.