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/Vehicle - Off
- Remove the appropriate component:
- KR27 Starter Relay
- Test for 70 to 110 ohms between the test points: Component terminal 85 & 86
- If not between 70 and 110 ohms
Replace the appropriate component: KR27 Starter Relay
- Go to next step: If between 70 and 110 ohms
- If not between 70 and 110 ohms
- Test for infinite resistance between the test points:
- Component terminal 30 & 85
- Component terminal 30 & 86
- Component terminal 30 & 87
- Component terminal 85 & 87
- Component terminal 86 & 87
- If less than infinite resistance
Replace the appropriate component: KR27 Starter Relay
- Go to next step: If infinite resistance
- Connect a 3 A fused jumper wire between the test points: Component terminal 86 & 12 V
Connect a jumper wire between the test points: Component terminal 85 & Ground
- Test for less than 2 ohms between the test points: Component terminal 30 & 87
- If 2 ohms or greater
Replace the appropriate component: KR27 Starter Relay
- Go to next step: If less than 2 ohms
- If 2 ohms or greater
- All OK.