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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
CAUTION: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

P1A0E

  1. Remove the generator battery disconnect control module cover. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Measure and record the voltage at ring terminal 3 to ground.
  3. Depress and hold the service disconnect switch and measure the voltage at ring terminal 1 to ground. The voltage should read the same as in step 2.
    • If no voltage was measured at ring terminal 1 with service disconnect switch depressed, replace BECM.
  4. Disconnect connectors C1 and C2 from the BECM.
  5. Test for less than 6.5 volts between C1 terminal 1 and C2 terminal 1, while depressing the service disconnect switch.
    • If greater than the specified range, replace BECM.
  6. Remove the generator battery cover. Refer to Generator Battery Temperature Sensor Replacement .
  7. Measure the resistance between C2 terminal 1 and ring terminal 1. Should measure 700 - 800 ohms.
    • If not within specified range, replace the harness assembly.
  8. Measure the resistance between C1 terminal 1 and ring terminal 7. Should measure 700 - 800 ohms.
    • If not within specified range, replace the harness assembly.

P1A0F

  1. Remove the generator battery disconnect control module cover. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Measure and record the voltage at ring terminal 3 to ground. Should read pack voltage.
  3. Measure the voltage at ring terminal 1 to ground. Should read no voltage.
    • If greater than the specified range, replace the BECM.
  4. Disconnect connectors C1 and C2 from the BECM.
  5. Remove the generator battery cover. Refer to Generator Battery Temperature Sensor Replacement .
  6. Measure the resistance between C2 terminal 1 and ring terminal 1. Should measure 700 - 800 ohms.
    • If not within specified range, replace the harness assembly.
  7. Measure the resistance between C1 terminal 1 and ring terminal 7. Should measure 700 - 800 ohms.
    • If not within specified range, replace the harness assembly.
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