Operation CHARM: Car repair manuals for everyone.
Home >> Cadillac >> 2013 >> XTS FWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0087

B0087




DTC B0086 or B0087

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 B0086 02
- Right Front Side Impact Sensor Short to Ground

DTC B0086 05
- Right Front Side Impact Sensor High Voltage/Open

DTC B0086 39
- Right Front Side Impact Sensor Internal Malfunction

DTC B0086 3A
- Right Front Side Impact Sensor Incorrect Component Installed

DTC B0086 71
- Right Front Side Impact Sensor Invalid Data

DTC B0087 02
- Left Rear Side Impact Sensor Short to Ground

DTC B0087 05
- Left Rear Side Impact Sensor High Voltage/Open

DTC B0087 39
- Left Rear Side Impact Sensor Internal Malfunction

DTC B0087 3A
- Left Rear Side Impact Sensor Incorrect Component Installed

DTC B0087 71
- Left 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 Inflatable Restraint Sensing and Diagnostic Module (SDM). The impact sensors can assist in determining the severity of some frontal and side collisions. The Inflatable Restraint Sensing and Diagnostic Module uses the input from the impact sensors to assist in determining the severity of a collision further supporting air bag deployment. If the Inflatable Restraint Sensing and Diagnostic Module determines a deployment is warranted, the Inflatable Restraint Sensing and Diagnostic Module 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:

B0086 02, B0087 02

* The sensor has been shorted to ground.

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

B0086 05, B0087 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.

B0086 39, B0087 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.

B0086 3A, B0087 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.

B0086 71, B0087 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 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 Fuel Pump and Level Sensor Assembly

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 Control Module References for scan tool information

Circuit/System Verification

Note:

* 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.

* Impact Sensor

* Inflatable Restraint Sensing and Diagnostic Module

* 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.

1. Ignition ON.

2. Verify that DTC B0086 or B0087 symptom byte 39 or 71 is not set as current.

• If DTC B0086 or B0087 symptom byte 39 or 71 is set as current
Replace the sensor listed below:

* B0086 - B63LF Side Impact Sensor-right front

* B0087 - B63RR Side Impact Sensor-Left Rear

• If DTC B0086 or B0087 symptom byte 39 or 71 is not set as current

3. Verify that DTC B0086 or B0087 symptom byte 3A is not set as current.

• If DTC B0086 or B0087 symptom byte 3A is set as current
Replace the appropriate B63 Side Impact Sensor

• If DTC B0086 or B0087 symptom byte 3A is not set as current

4. Verify that DTC B0086 or B0087 symptom byte 02 or 05 is set as current.

• If only DTC B0086 symptom byte 02 or 05 is set as current
Refer to Circuit/System Testing - Only DTC B0086 or B0087 is set.

• If only DTC B0087 symptom byte 02 or 05 is set as current
Refer to Circuit/System Testing - Only DTC B0086 or B0087 is set.

• If both DTC B0086 or B0087 symptom byte 02 or 05 is set as current
Refer to Circuit/System Testing - Both DTC B0086 and B0087 are set.

• If DTC B0086 or B0087 symptom byte 02 or 05 is not set as current

5. All OK.

Circuit/System Testing

Note: The signal circuit is shared at the K36 Inflatable Restraint Sensing and Diagnostic Module between the B63RF Side Impact Sensor Right Front and the B63LR Side Impact Sensor Left Rear (DTC B0086 and DTC B0087). 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 B0086 or B0087 is set

1. Ignition 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. Ignition ON.

4. Test for less than 10 V between the signal circuit terminal 1 and ground.

• If 10 V or greater

1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

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

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

• If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

• If less than 10 V

5. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

6. Test for less than 2 ohms between the B63 Side Impact Sensor signal circuit terminal 1 and the appropriate K36 Inflatable Restraint Sensing and Diagnostic Module signal circuit terminal listed below:

* Right front signal circuit - terminal 22 X2

* Left rear signal circuit - terminal 27 X2

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

• If less than 2 ohms

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

8. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

9. Verify the DTC does not set.

• If the DTC sets

1. Replace the B63 Side Impact Sensor.

2. Verify the DTC does not set.

• If the DTC sets, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

• If the DTC does not set.

3. All OK.

• If the DTC does not set

10. All OK.

Both DTC B0086 and B0087 are set

1. Ignition 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 greater than 50k ohms between each signal circuit listed below and ground:

* Right front signal circuit - terminal 22 X2

* Left rear signal circuit - terminal 27 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

3. Ignition ON.

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

* Right front signal circuit - terminal 22 X2

* Left rear signal circuit - terminal 27 X2

• If 1 V or greater

1. Ignition OFF. Disconnect the harness connector at the B63 Side Impact Sensor that failed the test. Ignition ON.

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

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

6. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

7. Verify the DTC does not set.

• If the DTC sets
Replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

• If the DTC does not set

8. All OK.

Repair Instructions

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

* Inflatable Restraint Side Impact Sensor Replacement (with ANH) Inflatable Restraint Side Impact Sensor Replacement (with ANH)

* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, programming and setup

pro multis · About Operation CHARM