Circuit/System Verification
- Ignition OFF, measure and record the battery voltage at the battery terminals.
- Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF
→If battery voltage is less than 12.4 V or more than 12.8 V.
Refer to Battery Inspection/Test .
↓If battery voltage is between 12.4 and 12.8 V.
- Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
- Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
- Verify the appropriate control module scan tool B+ and ignition voltage parameters are within 1 V of the battery voltage.
→If not within 1 V of the battery voltage
Refer to Circuit/System Testing .
↓If within 1 V of the battery voltage
- All OK.
→If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V.
Refer to Charging System Test .
↓If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.