Pinpoint Tests AA: DTC B2486
Seats
Pinpoint Test AA: DTC B2486
Refer to Wiring Diagram Set 123, Memory Seats for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) and Passenger Climate Controlled Seat Module - 2 (PCSM-2) monitor input voltage for correct operation. If the DCSM or PCSM-2 detect input voltage below 10 volts or above 15 volts, DTC B2486 will be stored in memory. If DTC B2486 is set, the DCSM or PCSM-2 enters a standby mode and suspends system outputs for 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 or PCSM-2 detect 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
- DSM
- DCSM
- PCSM-2
PINPOINT TEST AA: DTC B2486
NOTICE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) or Passenger Climate Controlled Seat Module - 2 (PCSM-2) 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 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.
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AA1 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 DTC 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 AA2.
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AA2 CHECK THE BATTERY CONDITION
- 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 AA3.
No
INSTALL a new battery. CLEAR all CMDTCs. TEST the system for normal operation.
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AA3 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
For DCSM DTC B2486, GO to AA4.
For PCSM-2 DTC B2486, GO to AA7.
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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AA4 CHECK FOR 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 Module C3377.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- Disconnect: DCSM C3265A.
- 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.
- 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 10 volts?
Yes
GO to AA5.
No
VERIFY BJB fuse 8 (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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3377.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AA5 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 5 ohms?
Yes
GO to AA6.
No
REPAIR the circuit. CLEAR all CMDTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3377.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AA6 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) Dual Climate Controlled Seat Module (DCSM). CLEAR all CMDTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3377.
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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3377.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AA7 CHECK FOR VOLTAGE TO THE PCSM-2
- Disconnect: PCSM-2 C3365A.
- Measure voltage between:
- PCSM-2 C3365A-E, circuit SBB07 (WH/RD), harness side and ground.
- PCSM-2 C3365A-F, circuit SBB07 (WH/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to AA8.
No
VERIFY BJB fuse 7 (30A) is OK. If OK, REPAIR the circuit. 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
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AA8 CHECK THE PCSM-2 GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between PCSM-2 C3365A-M, circuit GD133 (BK), harness side and ground.
- Repeat this measurement while wiggling the harness.
- Is the resistance less than 5 ohms?
Yes
GO to AA9.
No
REPAIR the circuit. CLEAR all CMDTCs. REPEAT the self-test.
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AA9 CHECK FOR CORRECT PCSM-2 OPERATION
- Check the harness and component side connectors for the following:
- corrosion.
- damaged pins.
- pushed-out pins.
- Connect: PCSM-2 C3365A.
- Make sure the PCSM-2 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 - PCSM-2.
- Is DTC B2486 still present?
Yes
INSTALL a new PCSM-2. REFER to Passenger Climate - Controlled Seat Module (PCSM-2) Passenger Climate - Controlled Seat Module (PCSM-2). CLEAR all CMDTCs. REPEAT the self-test.
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.
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