Pinpoint Test AK: DTC B2486
Seats
Pinpoint Test AK: DTC B2486
Refer to Wiring Diagram Set 119 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) monitors the input voltage for correct operation. If the DCSM detects input voltage below 10 volts or above 15 volts, it will store DTC B2486 in memory. If DTC B2486 is set, the DCSM enters a standby mode and suspends the system outputs for the operation of both seats until system voltage between 10 and 15 volts is restored and a climate controlled seat switch button is selected on.
- DTC B2486 (Climate Control Seat Module Voltage Out of Range) - If the DCSM detects voltage below 10 volts or greater than 15 volts, the DTC is set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- DCSM
PINPOINT TEST AK: DTC B2486
NOTICE: 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: DTC 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: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
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AK1 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 Testing and Inspection to diagnose the charging system.
No
GO to AK2.
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AK2 CHECK THE BATTERY CONDITION
NOTE: DTC 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.
- Ignition OFF.
- Carry out the Battery Condition Test. Refer to Battery, Mounting and Cables Testing and Inspection. Pinpoint Tests
- Did the battery pass the condition test?
Yes
If the battery passed the condition test, but required a recharge, REFER to Charging System Testing and Inspection 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 AK3.
No
INSTALL a new battery. CLEAR all CMDTCs. TEST the system for normal operation.
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AK3 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 AK4.
No
REFER to Charging System Testing and Inspection to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.
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AK4 CHECK VOLTAGE TO THE DCSM
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Seat Side Air Bag C313.
- Disconnect: DCSM C3305A.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module 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 Battery Disconnect.
- Ignition ON.
- Measure the voltage between:
- DCSM C3305A-E, circuit SBB12 (GN/RD), harness side and ground.
- DCSM C3305A-F, circuit SBB12 (GN/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to AK5.
No
VERIFY BJB fuse 12 (30A) is OK. If OK, REPAIR the circuit in question. If not OK, Refer to the Wiring Diagrams to identify possible causes of the circuit short. CLEAR all CMDTCs. REPEAT the self-test. Diagrams By Number
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AK5 CHECK THE DCSM GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between DCSM C3305A-M, circuit GD139 (BK/YE), harness side and ground.
- Repeat this measurement while wiggling the harness.
- Is the resistance less than 5 ohms?
Yes
GO to AK6.
No
REPAIR the circuit. CLEAR all CMDTCs. REPEAT the self-test.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AK6 CHECK FOR CORRECT DCSM OPERATION
- Check the harness and component side connectors for the following:
- corrosion.
- damaged pins.
- pushed-out pins.
- Connect: DCSM C3305A.
- 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 B1317 or B1318 still present?
Yes
INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) Dual Climate Controlled Seat Module (DCSM). CLEAR all CMDTCs. REPEAT the self-test.
DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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 module C313. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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