Circuit/System Verification

NOTE:

Refer to SIR Service Precautions .
Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
- Front impact sensor
- Side impact sensor
- Inflatable restraint sensing and diagnostic module
- Front impact sensor wiring harness connector
- Side impact sensor wiring harness connector
- Inflatable restraint sensing and diagnostic module wiring harness connector
The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease/lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.

Verify that DTC B0091 symptom byte 39 or 71 is not set as current.
- If DTC B0091 symptom byte 39 or 71 is set as current
  Replace the B59 Front Impact Sensor.
- Go to next step: If DTC B0091 symptom byte 39 or 71 is not set as current
Verify that DTC B0091 symptom byte 3 A is not set as current.
- If DTC B0091 symptom byte 3 A is set as current
  Replace the incorrect B59 Front Impact Sensor
- Go to next step: If DTC B0091 symptom byte 3 A is not set as current
Verify that DTC B0091 symptom byte 01, 02, 04, or 05 is not set as current.
- If DTC B0091 symptom byte 01, 02, 04, or 05 is set as current
  Refer to Circuit/System Testing.
- Go to next step: If DTC B0091 symptom byte 01, 02, 04, 05 is not set as current
All OK.