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B0085




DTC B0085 or B0088

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0085 02
- Left Front Side Impact Sensor Short to Ground

DTC B0085 05
- Left Front Side Impact Sensor High Voltage/Open

DTC B0085 39
- Left Front Side Impact Sensor Internal Malfunction

DTC B0085 3A
- Left Front Side Impact Sensor Incorrect Component Installed

DTC B0085 71
- Left Front Side Impact Sensor Invalid Data

DTC B0088 02
- Right Rear Side Impact Sensor Short to Ground

DTC B0088 05
- Right Rear Side Impact Sensor High Voltage/Open

DTC B0088 39
- Right Rear Side Impact Sensor Internal Malfunction

DTC B0088 3A
- Right Rear Side Impact Sensor Incorrect Component Installed

DTC B0088 71
- Right Rear Side Impact Sensor Invalid Data

Diagnostic Fault Information






Circuit/System Description

The impact sensors are equipped on vehicles to supplement the supplemental inflatable restraint (SIR) system performance. The impact sensors are electronic and are not part of the deployment loops, but instead provide inputs to the sensing and diagnostic module (SDM). The impact sensors can assist in determining the severity of some frontal and side collisions. The SDM uses the input from the impact sensors to assist in determining the severity of a collision further supporting air bag deployment. If the SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the air bags.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

Any of the following conditions exist for 10 seconds:

B0085 02, B0088 02

* The sensor has been shorted to ground.

* The sensor current is greater than 23 mA for greater than 5 milliseconds.

B0085 05, B0088 05

* The sensor circuit is open.

* The inflatable restraint sensing and diagnostic module has not received a message from the sensor for greater than 375 milliseconds.

B0085 39, B0088 39

* The inflatable restraint sensing and diagnostic module has received a Not OK message from the sensor.

* The inflatable restraint sensing and diagnostic module has not received a message.

B0085 3A, B0088 3A

* The inflatable restraint sensing and diagnostic module has received identification message from the sensor, which does not match the identification stored in the inflatable restraint sensing and diagnostic module memory.

* The inflatable restraint sensing and diagnostic module has reset the impact sensor twice without detecting the correct identification message.

B0085 71, B0088 71

The inflatable restraint sensing and diagnostic module has received invalid serial data from the sensor.

Action Taken When the DTC Sets

The inflatable restraint sensing and diagnostic module requests the instrument panel cluster to illuminate the AIR BAG indicator.

Conditions for Clearing the DTC

* The condition for setting the DTC no longer exists.

* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

* An ignition cycle is required for the DTC to go from current to history.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

Description and Operation

SIR System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Connector Repairs Connector Repairs

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

Note:

* Refer to SIR Service Precautions Technician Safety Information.

* 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.

- 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.

1. Verify that DTC B0085 or B0088 symptom byte 3A, 39 or 71 is not set as current.

• If DTC B0085 or B0088 symptom byte 3A, 39 or 71 is set as current
Replace the appropriate B63 side impact sensor

• If DTC B0085 or B0088 symptom byte 3A, 39 or 71 is not set as current

2. Verify that DTC B0085 or B0088 symptom byte 02 or 05 is set as current.

• If only DTC B0085 symptom byte 02 or 05 is set as current
Refer to Circuit/System Testing - Only DTC B0085 or B0088 is set.

• If only DTC B0088 symptom byte 02 or 05 is set as current
Refer to Circuit/System Testing - Only DTC B0085 or B0088 is set.

• If both DTC B0085 or B0088 symptom byte 02 or 05 is set as current
Refer to Circuit/System Testing - Both DTC B0085 and B0088 are set.

• If DTC B0085 or B0088 symptom byte 02 or 05 is not set as current

3. All OK.

Circuit/System Testing

Note: The signal circuit is shared at the K36 inflatable restraint sensing and diagnostic module between the B63LF side impact sensor left front and the B63RR side impact sensor right rear (DTC B0085 and DTC B0088). Therefore a short to ground or short to voltage in either of these signal circuits can set a DTC for both circuits, and an open in either circuit should only set its corresponding DTC.

Only DTC B0085 or B0088 is set

1. Vehicle OFF, disconnect the harness connector at the appropriate B63 side impact sensor. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

• If 10 ohms or greater

1. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K36 inflatable restraint sensing and diagnostic module.

• If less than 10 ohms

3. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module.

4. Test for less than 2 ohms between the signal circuit terminal 1 at the B63 side impact sensor and the K36 inflatable restraint sensing and diagnostic module terminal listed below:

* Left front signal terminal 19 X2

* Right rear signal terminal 30 X2

• If 2 ohms or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohms

5. Vehicle OFF, reconnect all harness connectors, press in the CPA (if equipped) until an audible and/or tactile click is heard.

6. Vehicle in Service Mode, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

7. Verify DTC B0085 or B0088 is not set.

• If DTC B0085 or B0088 is set
Replace the appropriate B63 side impact sensor.

• If DTC B0085 or B0088 is not set

8. All OK.

Both DTC B0085 and B0088 are set

1. Vehicle OFF. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 1 V between the signal circuit terminals listed below and ground:

* Left front signal circuit - terminal 19 X2

* Right rear signal circuit - terminal 30 X2

• If 1 V or greater

1. Disconnect the harness connector at the B63 side impact sensor that failed the test.

2. Test for less than 1 V between signal circuit and ground.

• If 1 V or greater, repair the short to voltage in the circuit.

• If less than 1 V, replace the B63 side impact sensor.

• If less than 1 V

3. Test for greater than 50k ohms between each signal circuit listed below and ground:

* Left front signal circuit - terminal 19 X2

* Right rear signal circuit - terminal 30 X2

• If 50k ohms or less

1. Disconnect the harness connector at the B63 side impact sensor that failed the test.

2. Test for infinite resistance between the signal circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the B63 side impact sensor.

• If greater than 50k ohms

4. Replace the K36 inflatable restraint sensing and diagnostic module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Inflatable Restraint Side Impact Sensor Replacement Inflatable Restraint Side Impact Sensor Replacement

* Control Module References Programming and Relearning for inflatable restraint sensing and diagnostic module replacement, programming and setup

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