Component Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Relay Test

Ignition Off.
Remove the KR73 Ignition Main Relay.
Test for 70 to 110 Ω between the relay terminals 85 and 86.
- If not the specified values
  Replace the KR73 Ignition Main Relay.
- Go to next step: If the Specified Values
Test for infinite resistance between the following terminals:
- 30 & 85
- 30 & 86
- 30 & 87
- 85 & 87
- 86 & 87
- If not Infinite resistance
  Replace the KR73 Ignition Main Relay.
- Go to next step: If infinite resistance
Connect a B+ 3 A fused jumper to terminal 85 & a grounded jumper to terminal 86.
Test for less than 2 Ω between terminals 30 & 87.
- if greater than 2 Ω
  Replace the KR73 Ignition Main Relay.
- Go to next step: If Less than 2 Ω
All OK,