Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, measure and record the battery voltage at the C1 Battery Terminals.
Verify the measured voltage is between 12 - 15 V.
- If voltage is less than 12 V or greater than 15 V
  Refer to Battery Inspection/Test .
- Go to next step: If voltage is between 12 - 15 V
Verify that a test lamp illuminates between the M64 starter motor B+ terminal 1 X2 and ground.
- If the test lamp does not illuminate
1. Ignition OFF.
2. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
- Go to next step: If the test lamp illuminates
Test for less than 0.5 V between the positive battery cable and terminal 1 X2 at the M64 starter motor with the ignition in the START position.
- If 0.5 V or greater
  Replace the positive battery cable.
- Go to next step: If less than 0.5 V
Test for less than 0.5 V between the negative battery cable and the M64 starter motor case with the ignition in the START position.
- If 0.5 V or greater
  Replace the negative battery cable.
- Go to next step: If less than 0.5 V
Remove the drive belts. Refer to Drive Belt Replacement for the 1.6L engine.
Verify the engine cranks slowly when attempting to start the vehicle.
- 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
Replace the M64 starter motor.