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Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 11133
Experience:  ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
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A SCANNER: DRIVER FRONTAL DEPLOYMENT LOOP STAGE 1 OPEN

Resolved Question:

CAN YOU DECIPHER THIS CODE FROM A SCANNER: DRIVER FRONTAL DEPLOYMENT LOOP STAGE 1 OPEN CIRCUIT. THE CODE ON THE SCANNER WAS B0012
Submitted: 4 years ago.
Category: Chevy
Expert:  Randall C replied 4 years ago.
Hello, below is the formal information pertaining to the code set, To diagnose would require a special tool etc.. In the cases in which I have run into this code, it has usually been a bad steering wheel modukle coil. It breaks internally casuing and open circuit to air bag.

DTC B0012 or B0013

Diagnostic Instructions

DTC Descriptors

DTC B0012 01

  • Driver Frontal Deployment Loop Stage 1 Short to Battery

DTC B0012 02

  • Driver Frontal Deployment Loop Stage 1 Short to Ground

DTC B0012 04

  • Driver Frontal Deployment Loop Stage 1 Open Circuit

DTC B0012 0D

  • Driver Frontal Deployment Loop Stage 1 Resistance Above Threshold

DTC B0012 0E

  • Driver Frontal Deployment Loop Stage 1 Resistance Below Threshold

DTC B0013 01

  • Driver Frontal Deployment Loop Stage 2 Short to Battery

DTC B0013 02

  • Driver Frontal Deployment Loop Stage 2 Short to Ground

DTC B0013 04

  • Driver Frontal Deployment Loop Stage 2 Open Circuit

DTC B0013 0D

  • Driver Frontal Deployment Loop Stage 2 Resistance Above Threshold

DTC B0013 0E

  • Driver Frontal Deployment Loop Stage 2 Resistance Below Threshold

Diagnostic Fault Information



Circuit/System Description

If a malfunction is detected, a DTC will be stored in non-volatile memory. During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the steering wheel module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.

There are 2 shorting bars used within each connector which will short together both steering wheel module stage 1 high circuit and steering wheel module stage 1 low circuit and both steering wheel module stage 2 high circuit and steering wheel module stage 2 low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0012 01 Stage 1 or B0013 01 Stage 2

The steering wheel module high and/or low circuit is short to voltage for 120 milliseconds.

B0012 02 Stage 1 or B0013 02 Stage 2

The steering wheel module high and/or low circuit is short to ground for 120 milliseconds.

B0012 04 Stage 1 or B0013 04 Stage 2

The steering wheel module high and/or low circuit is open for 120 milliseconds.

B0012 0D Stage 1 or B0013 0D Stage 2

The steering wheel module deployment loop resistance is greater than 5.1 ohms for 120 milliseconds.

B0012 0E Stage 1 or B0013 0E Stage 2

The steering wheel module deployment loop resistance is less than 1.3 ohms for 120 milliseconds.

Action Taken When the DTC Sets

  • The SDM commands the AIR BAG indicator ON.
  • The SDM will store a DTC, if an event occurs the system will still attempt deployments.

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.

Diagnostic Aids

  • When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This should be taken into account when testing for faults on these circuits.
  • This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop.

Special Tools Required

J 38715-A SIR Driver/Passenger Load Tool

Circuit/System Testing

Important: When removing connectors inspect for damage, corrosion or poor connection. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • The pretensioner
  • The air bag module
  • The SDM module
  • The air bag wiring harness connector
  • The SDM wiring harness connector
  1. Verify that the steering wheel module connector and the connector position assurance (CPA) are engaged. Important: The connector and 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.
¤ If the above condition is found, make the appropriate repair.
  1. Ignition OFF, disconnect the steering wheel module.
  2. With the appropriate adaptor, connect special tool J 38715-A.
  3. Ignition ON, with a scan tool, verify DTC is set as current.
¤ If DTC is not set or is set as history, replace the steering wheel module.
  1. Ignition OFF, disconnect special tool J 38715-A.
  2. Disconnect the steering wheel module coil in-line connector.
  3. With the appropriate adaptor, connect special tool J 38715-A.
  4. Ignition ON, with a scan tool, verify DTC is set as current.
¤ If DTC is not set or is set as history, replace the steering wheel module coil.
  1. Ignition OFF, disconnect special tool J 38715-A and the appropriate adaptor.
  2. Disconnect the harness connector at the SDM.
  3. Ignition ON, test for less than 1 volt between the appropriate high circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal A (X1)
    • Steering wheel module coil connector Stage 2 terminal A (X2)
¤ If not the specified range, test the circuit for a short to voltage.
  1. Test for less than 1 volt between the appropriate low circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal B (X1)
    • Steering wheel module coil connector Stage 2 terminal B (X2)
¤ If not the specified range, test the circuit for a short to voltage.
  1. Ignition OFF, test for infinite resistance between the appropriate high circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal A (X1)
    • Steering wheel module coil connector Stage 2 terminal A (X2)
¤ If not the specified range, test the circuit for a short to ground.
  1. Test for infinite resistance between the appropriate low circuit and ground.
    • Steering wheel module coil connector Stage 1 terminal B (X1)
    • Steering wheel module coil connector Stage 2 terminal B (X2)
¤ If not the specified range, test the circuit for a short to ground.
  1. Test for less than 1 ohm between the SDM connector and the air bag module connector high circuit.
    • Steering wheel module coil connector Stage 1 terminal A (X1) and SDM terminal 9
    • Steering wheel module coil connector Stage 2 terminal A (X2) and SDM terminal 5
¤ If not the specified range, test the circuit for an open/high resistance.
  1. Test for less than 1 ohm between the SDM connector and the air bag module connector low circuit.
    • Steering wheel module coil connector Stage 1 terminal B (X1) and SDM terminal 8
    • Steering wheel module coil connector Stage 2 terminal B (X2) and SDM terminal 4
¤ If not the specified range, test the circuit for an open/high resistance.
  1. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Verification Tests and Procedures

  • Inflatable Restraint Steering Wheel Module Coil Replacement
  • Inflatable Restraint Steering Wheel Module Replacement
  • SIR/SRS Wiring Repairs

 

Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 11133
Experience: ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
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