Pinpoint Test C: DTC B1890 - Pad Warning Lamp Circuit Short To Battery

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.

WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage 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: Supplemental restraint system (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: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

C1 CHECK FOR CONTINUOUS OR ON-DEMAND DTCs
- Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
- Was RCM on-demand DTC B1890 retrieved?
1. YES : Go to C2.
2. NO : This is an intermittent fault when present as a continuous memory DTC only (DTC not retrieved on demand). The fault condition is not present at this time. Go to C4.
C2 CHECK CIRCUIT CR116 (GN/WH) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
- Disconnect: PAD Indicator C2355
- Disconnect: RCM C310a and C310b
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
- Key in ON position.
- Measure the voltage between PAD indicator C2355-2, circuit CR116 (GN/WH), harness side and ground.
- Is any voltage present?
1. YES : Go to C3.
2. NO : REPAIR circuit CR116 (GN/WH). Go to C5.
C3 CHECK THE RCM
- Key in OFF position.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
- Connect: RCM C310a and C310b
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
  NOTE: DTC B1884 should be retrieved when carrying out the on-demand self test due to an open on circuit CR116 (GN/WH). DTC B1890 should not be retrieved at this time.
- Was RCM on-demand DTC B1890 retrieved?
1. YES : INSTALL a new RCM. REFER to Restraints Control Module (RCM) . Go to C5.
2. NO : INSTALL a new PAD indicator. Go to C5.
C4 CHECK FOR AN INTERMITTENT FAULT
- Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
- Was RCM on-demand DTC B1890 retrieved?
1. YES : This is a hard fault. The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. Go to C2.
2. NO : The fault is not present and cannot be recreated at this time.
  CHECK for causes of intermittent short to voltage on circuit CR116 (GN/WH). ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent wiring, terminal or connector concerns found. Go to C5.
C5 CHECK FOR ADDITIONAL SRS DTCs
- Key in OFF position.
  WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
- 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) Depowering and Repowering .
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Self Test - Restraints
- Are any RCM and/or OCSM DTCs retrieved indicating a fault?
1. YES : Do not clear any DTCs until all DTCs have been resolved. Go to the Supplemental Restraint System (SRS) DTC Chart for pinpoint test direction.
2. NO : CLEAR all RCM and OCSM DTCs. PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.