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 appropriate relay.
Test for 70 - 150 Ω between terminals (85 or 1) and (86 or 2).
- If less than 70 or greater than 150 Ω
  Replace the relay.
- Go to next step: If between 70 - 150 Ω
Test for infinite resistance between the terminals listed below:
- (30 or 3) and (86 or 2)
- (30 or 3) and (87 or 5)
- (30 or 3) and (85 or 1)
- (85 or 1) and (87 or 5)
- (86 or 2) and (87 or 5)
- If less than infinite resistance
  Replace the relay.
- Go to next step: If infinite resistance
Install a 3 A fused jumper wire between relay terminal (85 or 1) and 12 V. Install a jumper wire between relay terminal (86 or 2) and ground.
Test for less than 5.0 Ω between terminals (30 or 3) and (87 or 5).
- If 5.0 Ω or greater
  Replace the relay.
- Go to next step: If less than 5.0 Ω
All OK