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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1014 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test C: DTC B1890 - PAD Warning Lamp Circuit Short to Battery >> Pinpoint Test C: DTC B1890 - Pad Warning Lamp Circuit Short To Battery

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

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the safety canopy and cause serious personal injury or death.
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) when taking 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: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. C1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was 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.
  2. C2 CHECK CIRCUIT RR116 (BN/GN) FOR A SHORT TO VOLTAGE 
    1. YES  : Go to  C3.
    2. NO  : REPAIR circuit RR116 (BN/GN). Go to  C5.
  3. C3 CHECK THE RCM 
    NOTE: This pinpoint test step will attempt 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.
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Connect: RCM C2041a and C2041b
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • DIAGNOSTIC TIP:  When viewing on-demand DTCs with the PAD indicator disconnected, a circuit failure fault would normally be retrieved.
    • Did the PAD warning lamp on-demand DTC change from indicating B1890 to B1884? 
    1. YES  : INSTALL a new PAD indicator. Go to  C5.
    2. NO  : INSTALL a new RCM. REFER to Restraints Control Module (RCM) . Go to  C5.
  4. C4 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was 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  : CHECK for causes of intermittent short to battery on circuit RR116 (BN/GN). 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.
  5. 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/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Clear all RCM/OCSM Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Restraints
    • Are any RCM 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 in this article for pinpoint test direction.
    2. NO  : PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.
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