Chart C-12C - Cooling Fan No Low Speed Fan (3 Of 4)(3.8L "C" & "H" Bodies)

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

1. Checks for B+ at relay harness connector.
2. Jumpering relay terminals No. 1 and 4 by-passes relay, causing fans to run if fan motors and wiring are okay.
3. Grounding test terminal should cause PCM to ground circuit No. 1269. Test light should now glow if PCM is good and circuit No. 1269 is not open.
4. Checks for B+ and ground to fan motor. Test light on at this point indicates a faulty fan motor or motor connection.

Fig 1: Chart C-12C Schematic (3.8L "C" & "H" Bodies) Cooling Fan Circuit Diagnosis (No Low Speed Fan)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Chart C-12C Flow Chart (3 Of 4)(3.8L "C" & "H" Bodies) Cooling Fan Circuit Diagnosis (No Low Speed Fan)

Courtesy of GENERAL MOTORS CORP.