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Pinpoint Test Av : DTC B2486

NOTE: When taking measurements at Dual Climate Controlled Seat Module(DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.
NOTE: DTCs B2486 or B1676 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module(RCM) fuse is removed and the ignition switch is ON.
NOTE: The Supplemental Restraint System(SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

  1. AV1 RETRIEVE ALL CMDTCs IN ALL MODULES

    • Ignition ON.

    • Enter the following diagnostic mode on the scan tool: Self Test -- ALL CMDTCs.

    Is DTC B2486 or B1676 present in one or more modules AND P0563, P0620, P0625, P0626 or P065B retrieved from the PCM? 

    Yes  REFER to Charging System to diagnose the charging system.
    No  GO to  AV2.

  2. AV2 CHECK THE BATTERY CONDITION

    • Ignition OFF.

    Did the battery pass the condition test? 

    Yes  If the battery passed the condition test but required a recharge, REFER to Charging System to diagnose the charging system. CLEAR all Continuous Memory Diagnostic Trouble Codes(CMDTCs). TEST the system for normal operation. If the battery passed the condition test and did not require a recharge, GO to  AV3.
    No  INSTALL a new battery. CLEAR all CMDTCs. TEST the system for normal operation.

  3. AV3 CHECK THE CHARGING SYSTEM VOLTAGE

    NOTE: Do not allow the engine speed to increase above 2, 000 rpm while performing this step or the generator may self excite and result in default charging system output voltage. If engine speed goes above 2, 000 rpm, shut the vehicle OFF and restart the engine before performing this step.

    • Start the engine.

    • Measure voltage of the battery with and without a load on the charging system as follows:

      • Turn off all accessories and run the engine at 1, 500 rpm for a minimum of 2 minutes while measuring battery voltage.

      • Turn on headlights and HVAC fan on high and run engine at 1, 500 rpm for a minimum of 2 minutes while measuring battery voltage.

    Are the voltages between 13 and 15.2 volts? 

    Yes  GO to  AV4.
    No  REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.

  4. AV4 CHECK FOR VOLTAGE TO THE DCSM

    • Ignition OFF.

    • Disconnect: Passenger Seat Side Air Bag C337.

    • Disconnect: DCSM C3265A.

    • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any airbag when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

      Connect the battery ground cable. Refer to Battery, Mounting and Cables .

    • Ignition ON.

    • Measure voltage between:

      • DCSM C3265A-E, circuit CBX01 (GN/RD), harness side and ground.

      • DCSM C3265A-F, circuit CBX01 (GN/RD), harness side and ground.

    Are the voltages greater than 11 volts? 

    Yes  GO to  AV5.
    No  REPAIR the circuit in question. CLEAR all CMDTCs. REPEAT the self-test. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag C337. REPOWER the SRS. REFER to Supplemental Restraint System .

  5. AV5 CHECK THE DCSM GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure the resistance between DCSM C3265A-M, circuit GD903 (BK/WH), harness side and ground.

    • Repeat this measurement while wiggling the harness.

    Is the resistance less than 3 ohms? 

    Yes  GO to  AV6.
    No  REPAIR the circuit. CLEAR all CMDTCs. REPEAT the self-test. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag C337. REPOWER the SRS. REFER to Supplemental Restraint System .

  6. AV6 CHECK FOR CORRECT DCSM OPERATION

    • Check the harness and component side connectors for the following:

      • corrosion.
      • damaged pins.
      • pushed-out pins.

    • Connect: DCSM C3265A.

    • Make sure the DCSM connector is seated correctly.

    • Start the engine.

    • Operate the climate controlled seats and verify system operation.

    • Enter the following diagnostic mode on the scan tool: Self Test -- DCSM.

    Is DTC B2486 still present? 

    Yes  INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM)  in this information. CLEAR all CMDTCs. REPEAT the self-test. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag C337. REPOWER the SRS. REFER to Supplemental Restraint System .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs. REPEAT the self-test. DISCONNECT the battery ground cable. CONNECT passenger seat side air bag C337. REPOWER the SRS. REFER to Supplemental Restraint System .
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