DTC B0012 or B0013
Diagnostic Instructions
DTC Descriptors
DTC B0012 01: Driver Steering Wheel Air Bag
Deployment Loop Stage 1 Short to Battery |
DTC B0012 02: Driver Steering Wheel Air Bag
Deployment Loop Stage 1 Short to Ground |
DTC B0012 04: Driver Steering Wheel Air Bag
Deployment Loop Stage 1 Open |
DTC B0012 0D: Driver Steering Wheel Air Bag
Deployment Loop Stage 1 High Resistance |
DTC B0012 0E: Driver Steering Wheel Air Bag
Deployment Loop Stage 1 Low Resistance |
DTC B0013 01: Driver Steering Wheel Air Bag
Deployment Loop Stage 2 Short to Battery |
DTC B0013 02: Driver Steering Wheel Air Bag
Deployment Loop Stage 2 Short to Ground |
DTC B0013 04: Driver Steering Wheel Air Bag
Deployment Loop Stage 2 Open |
DTC B0013 0D: Driver Steering Wheel Air Bag
Deployment Loop Stage 2 High Resistance |
DTC B0013 0E: Driver Steering Wheel Air Bag
Deployment Loop Stage 2 Low Resistance |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
High Resistance
|
Open
|
Short to Voltage
|
Signal Performance
|
Driver Steering Wheel Air Bag Stage 1 High Control
|
B0012 02, B0012 0E
|
B0012 0D
|
B0012 04
|
B0012 01
|
—
|
Driver Steering Wheel Air Bag Stage 1 Low Control
|
B0012 02, B0012 0E
|
B0012 0D
|
B0012 04
|
B0012 01
|
—
|
Driver Steering Wheel Air Bag Stage 2 High Control
|
B0013 02, B0013 0E
|
B0013 0D
|
B0013 04
|
B0013 01
|
—
|
Driver Steering Wheel Air Bag Stage 2 Low Control
|
B0013 02, B0013 0E
|
B0013 0D
|
B0013 04
|
B0013 01
|
—
|
|
|
Circuit/System Description
During a frontal crash of sufficient force the inflatable
restraint sensing and diagnostic module will allow current to flow
through the deployment loop in order to deploy the driver steering
wheel air bag. The inflatable restraint sensing and diagnostic
module 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 the driver steering
wheel air bag coil connector which will short together both driver
steering wheel air bag stage 1 high circuit and driver steering
wheel air bag stage 1 low circuit and both driver steering wheel
air bag stage 2 high circuit and driver steering wheel air bag
stage 2 low circuit when the connector is disconnected. This will
help to prevent unwanted deployment of the air bag during
servicing.
Conditions for Running the DTC
Ignition voltage is between 9–16 V.
Conditions for Setting the DTC
B0012 01 stage 1 or B0013 01 stage 2
The driver steering wheel air bag control circuit is shorted to
voltage for 2 seconds.
B0012 02 stage 1 or B0013 02 stage 2
The driver steering wheel air bag control circuit is shorted to
ground for 2 seconds.
B0012 04 stage 1 or B0013 04 stage 2
The driver steering wheel air bag control circuit is open for 2
seconds.
B0012 0D stage 1 or B0013 0D stage 2
The driver steering wheel air bag deployment loop resistance is
more than 5.5 Ω for 2 seconds.
B0012 0E stage 1 or B0013 0E stage 2
The driver steering wheel air bag deployment loop resistance is
less than 1.7 Ω for 2 seconds.
Action Taken When the DTC Sets
• |
The inflatable restraint
sensing and diagnostic module requests the instrument cluster to
illuminate the SIR system AIR BAG indicator. |
• |
The inflatable restraint
sensing and diagnostic module will store a DTC, however if an event
occurs the system will still attempt deployment. |
Conditions for Clearing the DTC
• |
The condition for setting the
DTC is no longer exists. |
• |
A history DTC will clear once
100 malfunction-free ignition cycles have occurred. |
Diagnostic Aids
Note: The following
diagnostic aids apply for both current and history DTCs.
A worn steering wheel air bag coil can cause a repeated history
DTC to set with symptom byte 04 or 0D. To verify this condition,
turn the steering wheel 360 degrees in one direction then back 360
degrees in the other direction, multiple times, while viewing the
scan tool Deployment Loop Resistance 1 and 2 parameters.
An incorrectly installed CPA or incorrectly seated connector can
cause a shorting bar to short both control circuits together. Check
the connectors and CPAs if a DTC with symptom byte 02 or 0E is set,
to ensure the shorting bars are not causing the circuits to be
shorted together. Shorting bars are used in the locations listed
below:
• |
Driver steering wheel air
bag |
• |
Steering wheel air bag coil
assembly |
• |
Inline connectors – on
the driver steering wheel air bag side of the harness
connector |
• |
Harness side of the inflatable
restraint sensing and diagnostic module connector |
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EL-38125-580 Terminal Release Tool Kit
Circuit/System Verification
Note:
• |
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. |
|
- |
Driver Steering
Wheel Air bag |
|
- |
Driver steering
wheel air bag coil |
|
- |
Inflatable
restraint sensing and diagnostic module |
|
- |
Air bag 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. |
• |
If the condition
is intermittent or cannot be duplicated, disconnect the connectors
and add Nyogel lubricant 760G. This procedure will correct the high
resistance condition due to terminal fretting corrosion.
|
1. |
Verify the scan tool
Deployment Loop Resistance 1 and 2 parameters stay consistently
between 2.1 and 4.0 Ω without any spikes or dropouts while
turning the steering wheel 360 degrees in one direction then back
360 degrees in the other direction. |
⇒ If less than 2.1
or greater than 4.0 Ω
Refer to Circuit/System Testing.
⇒ If there are
spikes or dropouts
Replace the X85 driver steering wheel
air bag coil. ⇓ If
within 2.1 and 4.0 Ω without any spikes or
dropouts
2. |
DTC B0012 or B0013 should only
be set as a history DTC. |
⇒ If the DTC is set
as current
Refer to Circuit/System Testing.
⇓ If the DTC is set
as history
3. |
Verify the scan tool
Deployment Loop Resistance 1 and 2 parameters stay consistently
between 2.1 and 4.0 Ω without any drop outs or spikes while
moving the harness near each connector listed below. |
|
• |
X85 Steering wheel air bag
coil |
|
• |
F107 Steering wheel air
bag. |
|
• |
K36 inflatable restraint
sensing and diagnostic module |
⇒ If the reading is
erratic while moving the harness, perform the
following
|
• |
Inspect each connector
terminal for damage or corrosion and repair as necessary.
|
|
• |
Apply Nyogel lubricant 760G to
each connector terminal. |
|
• |
Insure each connector and CPA
is correctly seated. |
⇓ If within 2.1 and
4.0 Ω without any spikes or dropouts
Circuit/System Testing
1. |
Ignition OFF, disconnect the
scan tool and disconnect the harness connector listed below at the
F107 driver steering wheel air bag then wait for 120
seconds. |
2. |
Test for greater than 25
Ω between the control circuit terminal 1 and the control
circuit terminal 2. |
⇒ If 25 Ω or
less
|
2.1 |
Disconnect the harness
connector X1 at the K36 inflatable restraint sensing and diagnostic
module. |
|
Note: Some connectors may
be equipped with shorting bars as a safety component to prevent
accidental inflator deployment. When testing on a connector with
shorting bars, the shorting bars must be disabled to ensure
accurate test results. Insert an appropriate pick from EL-38125-580
and depress the shorting bars above the appropriate terminals. This
will lift the shorting bar from the terminal and allow accurate
test results. Take care not to damage the connector, shorting bar,
or terminal when depressing the shorting bar.
|
|
2.2 |
Test for infinite resistance
between the two control circuits. |
⇒ |
If less than infinite resistance, repair the short between the
two circuits. |
⇒ |
If infinite resistance, replace the K36 inflatable restraint
sensing and diagnostic module. |
⇓ If greater than 25
Ω
4. |
Test for less than 11 V
between the control circuit terminals listed below and
ground: |
|
• |
Control circuit terminal
1 |
|
• |
Control circuit terminal
2 |
⇒ If 11 V or
greater
|
4.1 |
Ignition OFF, disconnect the
harness connector X1 at the K36 inflatable restraint sensing and
diagnostic module, ignition ON. |
|
4.2 |
Test for less than 1 V between
the control circuit and ground. |
⇒ |
If 1 V or greater, repair the short to voltage on the
circuit. |
⇒ |
If less than 1 V, replace the K36 inflatable restraint sensing
and diagnostic module. |
⇓ If less than 11
V
6. |
Install a 3 A fused jumper
wire between the control circuit terminal 1 and the control circuit
terminal 2, ignition ON. |
7. |
Verify the scan tool
Deployment Loop Resistance parameter is consistently less than 2
Ω while turning the steering wheel 360 degrees in one
direction then back 360 degrees in the other direction.
|
⇒ If the reading is
erratic while turning the steering wheel
Replace the X85 driver steering wheel
air bag coil. ⇒ If
2 Ω or greater
|
7.1 |
Ignition OFF, disconnect the
harness connector X1 at the K36 inflatable restraint sensing and
diagnostic module. |
|
7.2 |
Test for less than 2 Ω
in the driver steering wheel air bag coil and each control circuit
end to end. |
⇒ |
If 2 Ω or greater, replace the coil or repair the
open/high resistance in the circuit. |
⇒ |
If less than 2 Ω, replace the K36 inflatable restraint
sensing and diagnostic module. |
⇓ If less than 2
Ω
8. |
Ignition OFF, connect the
harness connector at the F107 driver steering wheel air bag, press
in the CPA (if equipped) until an audible and/or tactile click is
heard. |
9. |
Ignition ON, clear DTCs.
Operate the vehicle within the Conditions for Running the
DTC. |
10. |
Verify DTC B0012 or B0013 is
not set. |
⇒ If DTC B0012 or
B0013 is set
Replace the F107 driver steering
wheel air bag. ⇓ If
DTC B0012 or B0013 is not set
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
|