DTC B001A or B001B
Diagnostic Instructions
DTC Descriptors
DTC B001A 01: Driver Seat Belt Anchor
Pretensioner Deployment Loop Short to Battery |
DTC B001A 02: Driver Seat Belt Anchor
Pretensioner Deployment Loop Short to Ground |
DTC B001A 04: Driver Seat Belt Anchor
Pretensioner Deployment Loop Open |
DTC B001A 0D: Driver Seat Belt Anchor
Pretensioner Deployment Loop High Resistance |
DTC B001A 0E: Driver Seat Belt Anchor
Pretensioner Deployment Loop Low Resistance |
DTC B001B 01: Passenger Seat Belt Anchor
Pretensioner Deployment Loop Short to Battery |
DTC B001B 02: Passenger Seat Belt Anchor
Pretensioner Deployment Loop Short to Ground |
DTC B001B 04: Passenger Seat Belt Anchor
Pretensioner Deployment Loop Open |
DTC B001B 0D: Passenger Seat Belt Anchor
Pretensioner Deployment Loop High Resistance |
DTC B001B 0E: Passenger Seat Belt Anchor
Pretensioner Deployment Loop Low Resistance |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
High Resistance
|
Open
|
Short to Voltage
|
Signal Performance
|
Driver Seat Belt Anchor Pretensioner Low Control
|
B001A 02, B001A 0E
|
B001A 0D
|
B001A 04
|
B001A 01
|
—
|
Driver Seat Belt Anchor Pretensioner High Control
|
B001A 02, B001A 0E
|
B001A 0D
|
B001A 04
|
B001A 01
|
—
|
Passenger Seat Belt Anchor Pretensioner Low Control
|
B001B 02, B001B 0E
|
B001B 0D
|
B001B 04
|
B001B 01
|
—
|
Passenger Seat Belt Anchor Pretensioner High Control
|
B001B 02, B001B 0E
|
B001B 0D
|
B001B 04
|
B001B 01
|
—
|
|
|
Circuit/System Description
During a side or 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
appropriate seat belt anchor pretensioner. 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.
A shorting bar used within the seat belt anchor pretensioner
connector will short together both seat belt anchor pretensioner
high and low control circuits when the connector is disconnected,
this will help to prevent unwanted deployment of the pretensioner
during servicing.
Conditions for Running the DTC
Ignition voltage is between 9–16 V.
Conditions for Setting the DTC
B001A 01, B001B 01
The seat belt anchor pretensioner control circuit is shorted to
voltage for 120 milliseconds.
B001A 02, B001B 02
The seat belt anchor pretensioner control circuit is shorted to
ground for 120 milliseconds.
B001A 04, B001B 04
The seat belt anchor pretensioner control circuit is open for 120
milliseconds.
B001A 0D, B001B 0D
The seat belt anchor pretensioner deployment loop resistance is
more than 4.2 Ω for 120 milliseconds.
B001A 0E, B001B 0E
The seat belt anchor pretensioner deployment loop resistance is
less than 1.7 Ω for 120 milliseconds.
Action Taken When the DTC Sets
• |
The inflatable restraint
sensing and diagnostic module requests the instrument cluster to
illuminate the AIR BAG indicator. |
• |
The inflatable restraint
sensing and diagnostic module will store a DTC, however 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 Aid
Note: The following
diagnostic aids apply for both current and history DTCs.
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 that the shorting bars are not causing the circuits to be
shorted together. Shorting bars locations are listed below:
• |
Inline connectors – on
the seat belt anchor pretensioner side of the harness
connector |
• |
Harness side of the inflatable
restraint sensing and diagnostic module connector |
Terminal fretting, an incorrectly installed CPA, or incorrectly
seated connector can cause an open/high resistance condition. Check
the circuit terminals for fretting, incorrectly installed CPAs, or
incorrectly seated connectors if a DTC with symptom byte 04 or 0D
is set.
If the seat belt anchor pretensionser has deployed under
unexpected conditions and/or DTC with symptom byte 01 is set, check
both control circuits for a short to voltage.
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. |
|
- |
Seat belt anchor
pretensioner |
|
- |
Inflatable
restraint sensing and diagnostic module |
|
- |
Seat belt anchor
pretensioner 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 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
moving the harness near each connector listed below: |
|
• |
F113 Seat belt anchor
pretensioner |
|
• |
K36 inflatable restraint
sensing and diagnostic module |
⇒ If less than 2.1
or greater than 4.0 Ω
Refer to Circuit/System Testing.
⇒ If there are
spikes or dropouts, perform the following
|
• |
Inspect each connector
terminal and harness 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
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. |
|
- |
Seat belt anchor
pretensioner |
|
- |
Inflatable
restraint sensing and diagnostic module |
|
- |
Seat belt anchor
pretensioner 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 Nyogel lubricant 760G. This procedure will correct the high
resistance condition due to terminal fretting corrosion.
|
1. |
Ignition OFF, disconnect the
scan tool and then disconnect the harness connector at the
appropriate F113 seat belt anchor pretensioner and then wait 120
seconds. |
2. |
Test for greater than 25
Ω between the control circuit terminals listed below:
|
|
• |
F113 Driver seat belt anchor
pretensioner terminal 1 and 2 |
|
• |
F113 Passenger seat belt
anchor pretensioner terminal 1 and 2 |
⇒ If 25 Ω or
less
|
2.1 |
Disconnect the harness
connector 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: |
|
• |
F113 seat belt anchor
pretensioner control circuit terminal 1 |
|
• |
F113 seat belt anchor
pretensioner control circuit terminal 2 |
⇒ If 11 V or
greater
|
4.1 |
Ignition OFF, disconnect the
harness connector 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. |
Test for greater than 25
Ω between the control circuit terminals listed below and
ground: |
|
• |
F113 seat belt anchor
pretensioner control circuit terminal 1 |
|
• |
F113 seat belt anchor
pretensioner control circuit terminal 2 |
⇒ If 25 Ω or
less
|
6.1 |
Disconnect the harness
connector at the K36 inflatable restraint sensing and diagnostic
module. |
|
6.2 |
Test for infinite resistance
between the control circuit and ground. |
⇒ |
If less than infinite resistance, repair the short to ground on
the circuit. |
⇒ |
If infinite resistance, replace the K36 inflatable restraint
sensing and diagnostic module. |
⇓ If greater than 25
Ω
7. |
Ignition OFF, install a 3 A
fused jumper wire between the control circuit terminals listed
below, ignition ON: |
|
• |
F113 Driver seat belt anchor
pretensioner terminal 1 and 2 |
|
• |
F113 Passenger seat belt
anchor pretensioner terminal 1 and 2 |
8. |
Verify the scan tool
Deployment Loop Resistance parameter is less than 2 Ω.
|
⇒ If 2 Ω or
greater
|
8.1 |
Ignition OFF, disconnect the
harness connector at the K36 inflatable restraint sensing and
diagnostic module. |
|
8.2 |
Test for less than 2 Ω
in each control circuit end to end. |
⇒ |
If 2 Ω or greater, 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
9. |
Ignition OFF, connect the
harness connector at the F113 seat belt anchor pretensioner, press
in the CPA (if equipped) until an audible and/or tactile click is
heard. |
10. |
Ignition ON, clear DTCs.
Operate the vehicle within the Conditions for Running the
DTC. |
11. |
Verify DTC B001A or B001B is
not set. |
⇒ If DTC B001A or
B001B is set
Replace the F113 seat belt anchor
pretensioner. ⇓ If
DTC B001A or B001B is not set
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
|