Pinpoint Test - DTC: Y B1415:81, B1418:11, B1418:81, B1418:93

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Supplemental Restraint System . For schematic and connector Information.

Normal Operation and Fault Conditions

The RCM monitors the passenger front door and LH C-pillar side impact sensors and circuits. For the following faults:

Open circuit
Short to voltage
Short to ground
Faulted passenger front door side impact sensor
Faulted LH C-pillar side impact sensor

NOTE: A short to ground on either impact sensor feed circuit sets DTC B1418:11. A short to voltage on either impact sensor feed circuit sets DTC B1418:93.

If a fault is detected, the RCM stores DTC B1415:81, B1418:11, B1418:81 or B1418:93 in memory and sends a message to the IPC to illuminate the airbag warning indicator.

The RCM communicates with each impact sensor. If the RCM is unable to communicate with the sensor, a DTC is stored in memory. A Continuous Memory Diagnostic Trouble Code (CMDTC) no operation (failure type: 93) can be set by a short to voltage on the return circuit of the impact sensor.

When the feed circuit of either impact sensor is shorted to voltage, an invalid data received fault (failure type :81) may also be present. For both sensors.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
B1415:81	Driver Side Restraints Sensor 2: Invalid Serial Data Received	A fault is indicated when the RCM senses a faulted LH C-pillar side impact sensor or an open on the LH C-pillar side impact sensor circuits.
B1418:11	Passenger Side Restraints Sensor 1: Circuit Short to Ground	A fault is indicated when the RCM senses a shorted passenger front door side impact sensor, a shorted LH C-pillar side impact sensor, a short to ground on the passenger front door side impact sensor feed circuit or a short to ground on the LH C-pillar side impact sensor feed circuit.
B1418:81	Passenger Side Restraints Sensor 1: Invalid Serial Data Received	A fault is indicated when the RCM senses a faulted passenger front door side impact sensor or an open on the passenger front door side impact sensor circuits.
B1418:93	Passenger Side Restraints Sensor 1: No Operation	A fault is indicated when the RCM senses a faulted LH C-pillar side impact sensor or passenger front door side impact sensor, or a short to voltage on the feed or return circuit of the LH C-pillar side impact sensor or passenger front door side impact sensor.

Possible Sources

Wiring, terminals or connectors
Passenger front door side impact sensor
LH C-pillar side impact sensor
RCM

Visual Inspection and Diagnostic Pre-checks

Inspect. For damaged wiring harness(es).

PINPOINT TEST A : B1415:81, B1418:11, B1418:81, B1418:93

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 be. Fore proceeding with the pinpoint test.
NOTE: SRS components should only be disconnected or reconnected 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 be. Fore releasing the vehicle to the customer.
NOTE: Do not probe any impact sensor. The impact sensor cannot be tested using a multi-meter.

A1 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

WARNING: Be. Fore beginning any service procedure in this article, refer to Health and Safety Precautions . Failure to follow this instruction may result in serious personal injury.

REFER to: Health and Safety Precautions .

Ignition ON.

Using a diagnostic scan tool, per. Form RCM self-test.

Were any Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test?

Yes	The fault(s) cannot be cleared until corrected and the Diagnostic Trouble Codes (DTCs) are no longer retrieved on-demand during self-test.For DTC B1418:11, GO to A2. For DTC B1418:93, GO to A6. For DTC B1415:81, GO to A10. For DTC B1418:81, GO to A13

No	The fault is intermittent when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to A17

A2 CHECK THE DRIVER SIDE RESTRAINTS SENSOR 2 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 fault reported 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 .
- Disconnect LH C-Pillar Side Impact Sensor C3248 .
- Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .
- Ignition ON.
- Using a diagnostic scan tool, per. Form RCM self-test.
Did the on-demand Diagnostic Trouble Codes (DTCs) change from B1418:11 to B1418:81?

Yes INSTALL a new LH C-pillar side impact sensor. REFER to: C-Pillar Side Impact Sensor . GO to A18

No GO to A3

A3 CHECK THE PASSENGER SIDE RESTRAINTS SENSOR 1 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 fault reported 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 .
- Connect LH C-Pillar Side Impact Sensor C3248 .
- Disconnect Passenger Front Door Side Impact Sensor C644 .
- Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .
- Ignition ON.
- Using a diagnostic scan tool, per. Form RCM self-test.
Did the on-demand DTC change from B1418:11 to B1418:81?

Yes INSTALL a new passenger front door side impact sensor. REFER to: Front Door Side Impact Sensor . GO to A18

No GO to A4

A4 CHECK THE LH (LEFT-HAND) C-PILLAR SIDE IMPACT SENSOR FEED CIRCUIT. For A SHORT TO GROUND AND SHORT BETWEEN SENSOR CIRCUITS

Ignition OFF.

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

Disconnect LH C-Pillar Side Impact Sensor C3248 .

Disconnect RCM C310A and C310B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3248-1	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3248-1	Courtesy of FORD MOTOR COMPANY	C3248-2

Are the resistances greater than 10, 000 ohms?

Yes

GO to A5

No	REPAIR the affected circuit(s). REFER to Connector Repair Procedures . For schematic and connector Information. GO to A18

A5 CHECK THE PASSENGER FRONT DOOR SIDE IMPACT SENSOR FEED CIRCUIT. For A SHORT TO GROUND AND SHORT BETWEEN SENSOR CIRCUITS

Measure:

Positive Lead	Measurement / Action	Negative Lead
C644-1	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C644-1	Courtesy of FORD MOTOR COMPANY	C644-2

Are the resistances greater than 10, 000 ohms?

Yes

GO to A16

No	REPAIR the affected circuit(s). REFER to Connector Repair Procedures . For schematic and connector Information. GO to A18

A6 CHECK THE PASSENGER DOOR SIDE IMPACT SENSOR OPERATION (NO OPERATION INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition.
- Ignition OFF.
- Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .
- Disconnect: Passenger Front Door Side Impact Sensor C644 .
- Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .
- Ignition ON.
- Using a diagnostic scan tool, clear the RCM Diagnostic Trouble Codes (DTCs).
- Using a diagnostic scan tool, per. Form RCM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the passenger front door side impact sensor disconnected, DTC B1418:81 may be retrieved, depending on the fault conditions present.
Is DTC B1418:93 retrieved on-demand?

Yes GO to A7

No INSTALL a new passenger front door side impact sensor. REFER to: Front Door Side Impact Sensor .

A7 CHECK THE LH (LEFT-HAND) C-PILLAR SIDE IMPACT SENSOR OPERATION (NO OPERATION INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition.
- Ignition OFF.
- Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .
- Connect: Passenger Front Door Side Impact Sensor C644 .
- Disconnect: LH C-pillar Side Impact Sensor C3248 .
- Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .
- Ignition ON.
- Using a diagnostic scan tool, clear the RCM Diagnostic Trouble Codes (DTCs).
- Using a diagnostic scan tool, per. Form RCM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the LH C-pillar side impact sensor side impact sensor disconnected, DTC B1415:81 may be retrieved, depending on the fault conditions present.
Is DTC B1418:93 retrieved on-demand?

Yes GO to A8

No INSTALL a new LH C-pillar side impact sensor. REFER to: C-Pillar Side Impact Sensor .

A8 CHECK THE LH (LEFT-HAND) C-PILLAR SIDE IMPACT SENSOR FEED CIRCUIT. For A SHORT TO VOLTAGE (INVALID SERIAL DATA RECEIVED)

Ignition OFF.

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

Disconnect RCM C310A and C310B .

Disconnect LH C-Pillar Side Impact Sensor C3248 .

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3248-1	Courtesy of FORD MOTOR COMPANY	Ground
C3248-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuits. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A18

GO to A9

A9 CHECK THE PASSENGER FRONT DOOR SIDE IMPACT SENSOR FEED CIRCUIT. For A SHORT TO VOLTAGE (INVALID SERIAL DATA RECEIVED)

Ignition OFF.

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

Disconnect Passenger Front Door Side Impact Sensor C644 .

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C644-1	Courtesy of FORD MOTOR COMPANY	Ground
C644-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the affected circuits. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A18

GO to A16

A10 CHECK THE LH (LEFT-HAND) C-PILLAR SIDE IMPACT SENSOR AND RCM (RESTRAINTS CONTROL MODULE) CONNECTIONS (INVALID SERIAL DATA RECEIVED)
- Ignition OFF.
- Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .
- Gain access to the LH C-pillar side impact sensor and inspect C3248 to make sure it is fully seated and locked. Seat and lock the connector as necessary.
- Gain access to the RCM and inspect C310A and C310B to make sure they are fully seated and locked. Seat and lock the connector(s) as necessary. REFER to: Restraints Control Module (RCM) .
- Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .
- Ignition ON.
- Using a diagnostic scan tool, per. Form RCM self-test.
Was DTC B1415:81 retrieved on-demand during self-test?

Yes GO to A11

No The fault is corrected. GO to A18

A11 CHECK THE LH (LEFT-HAND) C-PILLAR SIDE IMPACT SENSOR CIRCUITS. For AN OPEN (INVALID SERIAL DATA RECEIVED)

Ignition OFF.

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

Disconnect RCM C310A and C310B .

Disconnect LH C-Pillar Side Impact Sensor C3248 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C310B-45	Courtesy of FORD MOTOR COMPANY	C3248-1
C310B-46	Courtesy of FORD MOTOR COMPANY	C3248-2

Are the resistances less than 0.5 ohm?

Yes

GO to A12

No	REPAIR the affected circuit. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A18

A12 CHECK THE DRIVER SIDE RESTRAINTS SENSOR 2 DTC (DIAGNOSTIC TROUBLE CODE). For A FAULT STATUS CHANGE (INVALID SERIAL DATA RECEIVED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the fault reported 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
C3248-1	Courtesy of FORD MOTOR COMPANY	C3248-2

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Using a diagnostic scan tool, per. Form RCM self-test.

Did the DTC change from B1415:81 to B1418:11?

Yes	REMOVE the fused jumper wire and INSTALL a new LH C-pillar side impact sensor. REFER to: C-Pillar Side Impact Sensor . GO to A18

No	REMOVE the fused jumper wire and GO to A16

A13 CHECK THE PASSENGER FRONT DOOR SIDE IMPACT SENSOR AND RCM (RESTRAINTS CONTROL MODULE) CONNECTIONS (INVALID SERIAL DATA RECEIVED)
- Ignition OFF.
- Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .
- Gain access to the passenger front door side impact sensor and inspect C644 to make sure it is fully seated and locked. Seat and lock the connector as necessary.
- Gain access to the RCM and inspect C310A and C310B to make sure they are fully seated and locked. Seat and lock the connector(s) as necessary. REFER to: Restraints Control Module (RCM) .
- Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .
- Ignition ON.
- Using a diagnostic scan tool, per. Form RCM self-test.
Was DTC B1418:81 retrieved on-demand during self-test?

Yes GO to A14

No Fault corrected. GO to A18

A14 CHECK THE PASSENGER FRONT DOOR SIDE IMPACT SENSOR CIRCUITS. For AN OPEN (INVALID SERIAL DATA RECEIVED)

Ignition OFF.

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

Disconnect RCM C310A and C310B .

Disconnect Passenger Front Door Side Impact Sensor C644 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C310B-32	Courtesy of FORD MOTOR COMPANY	C644-1
C310B-31	Courtesy of FORD MOTOR COMPANY	C644-2

Are the resistances less than 0.5 ohm?

Yes

GO to A15

No	REPAIR the affected circuit. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A18

A15 CHECK THE PASSENGER SIDE RESTRAINTS SENSOR 1 DTC (DIAGNOSTIC TROUBLE CODE). For A FAULT STATUS CHANGE (INVALID SERIAL DATA RECEIVED)

Connect RCM C310A and C310B .

Connect a fused jumper wire:

Lead 1	Measurement / Action	Lead 2
C644-1	Courtesy of FORD MOTOR COMPANY	C644-2

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Using a diagnostic scan tool, per. Form RCM self-test.

Did the DTC change from B1418:81 to B1418:11?

Yes	REMOVE the fused jumper wire and INSTALL a new passenger front door side impact sensor. REFER to: Front Door Side Impact Sensor . GO to A18

No	REMOVE the fused jumper wire and GO to A16

A16 CONFIRM THE RCM (RESTRAINTS CONTROL MODULE) FAULT

NOTE: Make sure all SRS components and the RCM electrical connectors are connected be. Fore 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 damage, 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 Connector Repair Procedures . For schematic and connector Information.

Connect LH C-Pillar Side Impact Sensor C3248 (if previously disconnected).

Connect Passenger Front Door Side Impact Sensor C644 (if previously disconnected).

Connect RCM C310A and C310B (if previously disconnected).

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Using a diagnostic scan tool, per. Form RCM self-test.

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

Yes	CHECK OASIS. For any applicable Technical Service Bulletins (TSBs). If a TSB exists. For this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new RCM. REFER to: Restraints Control Module (RCM) . GO to A18

No	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. GO to A17

A17 CHECK. For AN INTERMITTENT FAULT

Ignition OFF.

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

Disconnect LH C-Pillar Side Impact Sensor C3248 and Passenger Front Door Side Impact Sensor C644 .

Disconnect RCM C310A and C310B .

Inspect:
- harness and component connectors. For loose or spread terminals and loose or frayed wire connections at terminals.
- wire harness. For any damage, pinched, cut or pierced wires.
- RCM C310A and C310B Connector Position Assurance (CPA) lever/lock. For correct operation.
- repair any concerns found. REFER to Connector Repair Procedures . For schematic and connector Information.

Connect LH C-Pillar Side Impact Sensor C3248 and Passenger Front Door Side Impact Sensor C644 .

Connect RCM C310A and C310B .

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Using a diagnostic scan tool, per. Form RCM self-test.

Was DTC B1415:81, B1418:11, B1418:81 or B1418:93 retrieved on-demand during self-test?

Yes	The fault(s) cannot be cleared until corrected and the DTC is no longer retrieved on-demand during self-test.For DTC B1418:11, GO to A2. For DTC B1418:93, GO to A8. For DTC B1415:81, GO to A10. For DTC B1418:81, GO to A13

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 A18

A18 CHECK. For ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF.

Reconnect all SRS components (if previously disconnected).

If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

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

Using a diagnostic scan tool, per. Form the

Restraints self-test.

Are any RCMOCSM and/or BECMB 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. REFER to: Airbag Supplemental Restraint System (SRS) .

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