Pinpoint Test C: B0004:11, B0004:12, B0004:13, B0004:1A

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagrams SUPPLEMENTAL RESTRAINT SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) - System Operation and Component Description .

The RCM continuously monitors the driver knee airbag circuits for the following faults:

Resistance out of range
Unexpected voltage
Short to ground
Faulted driver knee airbag

If a fault is detected, the RCM stores DTC B0004:11, B0004:12, B0004:13 or B0004:1A in memory and sends a message to the IPC to illuminate the airbag warning indicator.

The RCM analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the value displayed is lower or higher than the desired range ( refer to diagram below), the RCM can set a DTC. As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern. This test uses process of elimination to diagnose each part of the deployment loop circuit including:

Wiring
Connections
Driver knee airbag
RCM

Courtesy of FORD MOTOR COMPANY

1 - May set DTC
2 - Desired range

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
RCM B0004:11	Driver Knee Bolster Deployment Control: Circuit Short To Ground	A fault is indicated when the RCM senses a short to ground on either driver knee airbag circuit for more than 6 seconds.
RCM B0004:12	Driver Knee Bolster Deployment Control: Circuit Short To Battery	A fault is indicated when the RCM senses a short to voltage on either driver knee airbag circuit for more than 6 seconds.
RCM B0004:13	Driver Knee Bolster Deployment Control: Circuit Open	A fault is indicated when the RCM measures more than the desired resistance between the driver knee airbag circuits for more than 6 seconds.
RCM B0004:1A	Driver Knee Bolster Deployment Control: Circuit Resistance Below Threshold	A fault is indicated when the RCM measures less than the desired resistance between the driver knee airbag circuits for more than 6 seconds.

Possible Sources

Wiring, terminals or connectors
Driver knee airbag
RCM

WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

C1 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

WARNING: Before beginning any service procedure In this article, refer to Safety warnings in General Information. Failure to follow this instruction may result in serious personal injury.

REFER to: Pyrotechnic Device Health and Safety Precautions .

Ignition ON.

Using a diagnostic scan tool, perform RCM self-test.

Was DTC B0004:11, B0004:12, B0004:13 and B0004:1A retrieved on-demand during self-test?

Yes

This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test. If DTC U3003:16 or U3003:17 is also retrieved on-demand, GO to Pinpoint Test BD If DTC U3003:16 or U3003:17 is not retrieved on-demand during self-test, DIAGNOSE the driver knee airbag Diagnostic Trouble Codes (DTCs). For DTC B0004:13 or B0004:1A, GO to C2 For DTC B0004:11, GO to C8 For DTC B0004:12, GO to C10

This is an intermittent fault when present as a CMDTC only. If DTC U3003:16 or U3003:17 is also retrieved on-demand, GO to Pinpoint Test BD If DTC U3003:16 or U3003:17 is not retrieved on-demand during self-test, DIAGNOSE the driver knee airbag Continuous Memory Diagnostic Trouble Codes (CMDTCs). For DTC B0004:13 or B0004:1A, GO to C13 For DTC B0004:11, GO to C14 For DTC B0004:12, GO to C15

C2 CHECK THE DRIVER KNEE BOLSTER DEPLOYMENT CONTROL (DEPLOY_02_R) PID (PARAMETER IDENTIFICATION)
- Access the RCM and monitor the DEPLOY_02_R (mOhm) PID
- Monitor and record the value of the PID.
Does the PID value read between 1.7 and 2.98 ohms?

Yes GO to C12

No GO to C3

C3 CHECK THE DRIVER KNEE BOLSTER DEPLOYMENT CONTROL (DEPLOY_02_R) PID (PARAMETER IDENTIFICATION) WHILE CARRYING OUT THE HARNESS TEST

Access the RCM and monitor the DEPLOY_02_R (mOhm) PID

While monitoring the PID, carry out the harness test of the driver knee airbag circuits and accessible connectors (including any inline connectors) by wiggling and flexing the wire harness and connectors frequently.

Does the PID value stay between 1.7 and 2.98 ohms while carrying out the harness test?

Yes	DEPOWER the SRS and REPAIR the connector, terminals or wire harness as needed. REFER to: Supplemental Restraint System (SRS) Depowering . Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

No	For PID value less than 1.7 ohms, GO to C4 For PID value greater than 2.98 ohms, GO to C6

C4 CHECK THE DRIVER KNEE AIRBAG DEPLOYMENT CONTROL DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (LOW RESISTANCE INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.
- Ignition OFF.
- Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .
- Remove the driver knee airbag. REFER to: Driver Knee Airbag .
- Repower the SRS.
  Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).
- Ignition ON.
- Using a diagnostic scan tool, perform RCM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the driver knee airbag disconnected, an open circuit fault is normally retrieved.
Did the on-demand DTC change from B0004:1A to B0004:13?

Yes GO to C11

No GO to C5

C5 CHECK FOR A SHORT BETWEEN THE DRIVER KNEE AIRBAG CIRCUITS

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect RCM C310A and C310B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2432-1	Courtesy of FORD MOTOR COMPANY	C2432-2

Is the resistance greater than 10, 000 ohms?

Yes

GO to C12

No	REPAIR the circuit(s). Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

C6 CHECK THE DRIVER KNEE AIRBAG CIRCUITS FOR AN OPEN

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Remove the driver knee airbag. REFER to: Driver Knee Airbag .

Disconnect RCM C310A and C310B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C310A-22	Courtesy of FORD MOTOR COMPANY	C2432-1
C310A-21	Courtesy of FORD MOTOR COMPANY	C2432-2

Are the resistances less than 0.5 ohm?

Yes

GO to C7

No	REPAIR the circuits. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

C7 CHECK THE DRIVER KNEE AIRBAG DEPLOYMENT CONTROL DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (OPEN INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.

Connect RCM C310A and C310B.

Connect a fused jumper wire:

Lead 1	Measurement / Action	Lead 2
C2432-1	Courtesy of FORD MOTOR COMPANY	C2432-2

Repower the SRS.
Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).

Ignition ON.

Using a diagnostic scan tool, perform RCM self-test.

DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the driver knee airbag circuits shorted together, a low resistance fault is normally retrieved.

Did the on-demand DTC change from B0004:13 to B0004:1A?

Yes	REMOVE the fused jumper wire and GO to C11

No	REMOVE the fused jumper wire and GO to C12

C8 CHECK THE DRIVER KNEE AIRBAG DEPLOYMENT CONTROL DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (SHORT TO GROUND INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.
- Ignition OFF.
- Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering . REFER to: Supplemental Restraint System (SRS) Depowering .
- Remove the driver knee airbag. REFER to: Driver Knee Airbag .
- Repower the SRS.
  Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).
- Ignition ON.
- Using a diagnostic scan tool, perform RCM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the driver knee airbag disconnected, an open circuit fault is normally retrieved.
Did the on-demand DTC change from B0004:11 to B0004:13?

Yes GO to C11

No GO to C9

C9 CHECK THE DRIVER KNEE AIRBAG CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect RCM C310A and C310B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2432-1	Courtesy of FORD MOTOR COMPANY	Ground
C2432-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to C12

No	REPAIR the circuit(s). Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

C10 CHECK THE DRIVER KNEE AIRBAG CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Remove the driver knee airbag. REFER to: Driver Knee Airbag .

Disconnect RCM C310A and C310B.

Repower the SRS.
Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2432-1	Courtesy of FORD MOTOR COMPANY	Ground
C2432-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit(s). Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

GO to C12

C11 CONFIRM THE DRIVER KNEE AIRBAG FAULT

NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Prior to reconnecting any previously disconnected SRS component:
- Inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- Inspect wire harness for any damaged, pinched, cut or pierced wires.
- Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
- Inspect Driver Knee Airbag C2432 and make sure the Connector Position Assurance (CPA) tabs are not broken and the clip is not damaged.
- Repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

Install the driver knee airbag. REFER to: Driver Knee Airbag .

Repower the SRS.
Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).

Ignition ON.

Using a diagnostic scan tool, perform RCM self-test.

Was the original DTC retrieved on-demand during self-test?

Yes	INSTALL a new driver knee airbag. REFER to: Driver Knee Airbag . GO to C17

In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. For DTC B0004:13 or B0004:1A, GO to C13 For DTC B0004:11, GO to C14 For DTC B0004:12, GO to C15

C12 CONFIRM THE RCM (RESTRAINTS CONTROL MODULE) FAULT

NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Prior to reconnecting any previously disconnected SRS component:
- Inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- Inspect wire harness for any damaged, pinched, cut or pierced wires.
- Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
- Repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

Install the driver knee airbag (if previously removed). REFER to: Driver Knee Airbag .

Connect RCM C310A and C310B (if previously disconnected).

Repower the SRS.
Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).

Ignition ON.

Using a diagnostic scan tool, perform RCM self-test.

Was the original DTC retrieved on-demand during self-test?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM. REFER to: Restraints Control Module (RCM) . GO to C17

C13 CHECK THE DRIVER KNEE BOLSTER DEPLOYMENT CONTROL (DEPLOY_02_R) PID (PARAMETER IDENTIFICATION) FOR AN INTERMITTENT LOW RESISTANCE OR OPEN CIRCUIT FAULT

Access the RCM and monitor the DEPLOY_02_R (mOhm) PID

While monitoring the PID, attempt to recreate the fault by wiggling connectors (including any inline connectors) and flexing the wire harness frequently.

Does the PID value stay between 1.7 and 2.98 ohms?

Yes	The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to C16

No	DEPOWER the SRS. REFER to: Supplemental Restraint System (SRS) Depowering . REPAIR as necessary. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

C14 CHECK THE DRIVER KNEE AIRBAG DEPLOYMENT CONTROL CIRCUITS FOR AN INTERMITTENT SHORT TO GROUND FAULT

Attempt to recreate the fault by wiggling connectors (including any inline connectors) and flexing the wire harness frequently.

Using a diagnostic scan tool, perform RCM self-test.

Was DTC B0004:11 retrieved on-demand during self-test?

Yes	DEPOWER the SRS and REPAIR as necessary. REFER to: Supplemental Restraint System (SRS) Depowering . Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

No	The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to C16

C15 CHECK THE DRIVER KNEE AIRBAG DEPLOYMENT CONTROL CIRCUITS FOR AN INTERMITTENT SHORT TO BATTERY FAULT

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Remove the driver knee airbag. REFER to: Driver Knee Airbag .

Repower the SRS.
Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).

Ignition ON.

Attempt to recreate the fault by wiggling connectors (including any inline connectors) and flexing the wire harness frequently.

Using a diagnostic scan tool, perform RCM self-test.

Was DTC B0004:12 retrieved on-demand during self-test?

Yes	DEPOWER the SRS and REPAIR as necessary. REFER to: Supplemental Restraint System (SRS) Depowering . Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

No	The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to C16

C16 CHECK THE HARNESS AND CONNECTORS

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Remove the driver knee airbag. REFER to: Driver Knee Airbag .
- Inspect connector(s) (including any inline connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
- Inspect wire harness for any damage, pinched, cut or pierced wires.
- Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
- Inspect Driver Knee Airbag C2432 and make sure the Connector Position Assurance (CPA) tabs are not broken and the clip is not damaged.

Were any concerns found?

Yes	REPAIR as necessary. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to C17

No	The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to C17

C17 CHECK FOR ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF.

Connect all previously disconnected components and connectors.

Install the driver knee airbag (if previously removed). REFER to: Driver Knee Airbag .

If previously directed to depower the SRS, repower the SRS.
Do not prove out the SRS at this time. REFER to: (501-20B Supplemental Restraint System, General Procedures).

Ignition ON.

NOTE: When selecting Restraints from the Self Test menu, DTCs are retrieved from the RCM and OCSM.

Using a diagnostic scan tool, perform

Restraints self-test.

Are any RCM or OCSM Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test?

Yes	Do not clear any Diagnostic Trouble Codes (DTCs) until all Diagnostic Trouble Codes (DTCs) have been resolved. DIAGNOSE and REPAIR the SRS Diagnostic Trouble Codes (DTCs). REFER to the DTC Chart In this article.

No	The repair is complete. RETURN the vehicle to the customer.