Component Testing
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Relay Test
- Ignition OFF, disconnect the KR5 Rear Defogger Relay.
- Test for 60-180 Ω between terminals 85 and 86.
- If less than 60 Ω or greater than 180 Ω
Replace the KR5 Rear Defogger Relay.
- Go to next step: If between 60-180 Ω
- If less than 60 Ω or greater than 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 KR5 Rear Defogger Relay.
- Go to next step: If infinite resistance
- Install a 3 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 KR5 Rear Defogger Relay.
- Go to next step: If less than 2 Ω
- If 2 Ω or greater
- All OK