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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 463 (Engine Cooling System) >> Diagnostic Information and Procedures >> Cooling Fan Inoperative (without HP2) >> Diagnostic Fault Information

Diagnostic Fault Information

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Fan Low Relay

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Fan Low Relay Coil Ignition Circuit - P0480 - -
Relay Switch B+ Circuit 1 1 - -
Fan Low Relay Control Circuit P0480 P0480 P0480 -
Fan Low Relay Controlled Output Circuit 1 1 2 -
  1. Both fans inoperative at low speed, Left fan inoperative at high speed.
  2. Both fans always ON at low speed.
Fan Control Relay

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Fan Control Relay Coil Ignition Circuit - P0481 - -
Fan Control Relay Switch Circuit 1 2 - -
Fan Control Relay Control Circuit P0481 2 P0481 -
Fan Control Relay Switched Output Circuits 1 3 - -
  1. Both fans operate at high speed only.
  2. Left fan inoperative. Right fan inoperative at low speed.
  3. Both fans inoperative at low speed, or left fan inoperative at high speed.
Fan High Relay

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Fan High Relay Coil Ignition Circuit - P0481 - -
Fan High Relay Switch B+ Circuit 1 1 - -
Fan High Relay Control Circuit P0481 1 P0481 -
Fan High Relay Controlled Output Circuit 3 4 2 -
  1. Right fan inoperative at high speed.
  2. Right fan always ON.
  3. Both fans inoperative.
  4. Both fans inoperative at low speed or right fan inoperative at high speed.
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