Circuit/System 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.

Ignition OFF, all vehicle systems Off
Verify the Battery passes a battery test. Refer to Battery Inspection/Test .
- If the Battery does not pass the test
  Replace the Battery.
- Go to next step: If the Battery passes the test
Remove the drive belts. Refer to.
- Accessory Drive Primary Belt Replacement for the 2.0L engines
- Accessory Drive Primary Belt Replacement for the 2.7L engine
Verify the engine cranks slowly while cranking the engine.
- If the engine cranks at normal speed
  Inspect the engine and belt drive system for mechanical binding, seized generator etc.
- Go to next step: If the engine cranks slowly
Test for less than 900 mV between terminal A X2 at the X50D Fuse Block - Battery and terminal A X4 at the X50A Fuse Block - Underhood while cranking the engine.
- If 900 mV or greater
  Replace the positive battery cable.
- Go to next step: If less than 500 mV
Test for less than 500 mV between terminal A X4 at the X50A Fuse Block - Underhood and terminal A X2 at the M64 Starter Motor while cranking the engine.
- If 500 mV or greater
  Replace the Auxiliary Generator Battery Jumper Cable Replacement.
- Go to next step: If less than 500 mV
Test for less than 500 mV between the negative battery cable and the M64 Starter Motor case while cranking the engine.
- If 500 mV or greater
  Replace the negative battery cable.
- Go to next step: If less than 500 mV
Replace the M64 Starter Motor.