Component Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Relay Test

Ignition OFF, disconnect the KR27 starter relay.
Test for 60-180 Ω between terminals 85 and 86.
- If less than 60 or greater than 180 Ω
  Replace the relay.
- If between 60-180 Ω
Test for infinite resistance between the terminals listed below:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If less than infinite resistance
  Replace the relay.
- If infinite resistance
Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
Test for less than 2 Ω between terminals 30 and 87.
- If 2 Ω or greater
  Replace the relay.
- If less than 2 Ω
All OK