Component Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Relay Test

Ignition OFF.
Disconnect a cooling fan relay.
Test for 70-110 Ω between terminals 85/2 and 86/1.
- If less than or greater than the specified range
  Replace the cooling fan relay.
- If within the specified range
Test for infinite resistance between the following terminals:
- 30/3 and 86/1
- 30/3 and 87/5
- 30/3 and 85/2
- 85/2 and 87/5
- If less than infinite resistance
  Replace the cooling fan relay.
- If infinite resistance
Install a 20 A fused jumper wire between relay terminal 85/2 and 12 V.
Install a jumper wire between relay terminal 86/1 and ground.
Test for less than 2 Ω between terminals 30/3 and 87/5.
- If 2 Ω or greater
  Replace the cooling fan relay.
- If less than 2 Ω
All OK.

Cooling Fan Motor Test

Ignition OFF.
Disconnect the harness connector at the R10 Cooling Fan Resistor.
Connect a jumper wire between the R10 Cooling Fan Resistor terminal 1 and ground.
Connect an appropriately fused jumper wire between a R10 Cooling Fan Resistor terminal listed below and B+.
- R10 Cooling Fan Resistor low speed terminal 2
- R10 Cooling Fan Resistor medium speed terminal 3
- R10 Cooling Fan Resistor high speed terminal 4
Verify the G10 Cooling Fan Motor operates when voltage is applied to each terminal.
- The cooling fan does not operate
  Replace the G10 Cooling Fan Motor.
- The cooling fan operates
All OK.