Diagnostic Routine AL
Diagnostic Routine AL
Diagnostic Overview
B1317, B1318, B2486
Refer to Wiring Diagram Set 119 for schematic and connector information Electrical Diagrams.
Refer to Wiring Diagram Set 123 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
DTC Fault Trigger Conditions
Pinpoint Test
NOTICE: When taking measurements at DCSM (Dual Climate Controlled Seat Module) 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 DTCs (Diagnostic Trouble Codes) and system failure. Touching the tip of these connector pins is recommended instead.
1. RETRIEVE ALL CMDTCs (Continuous Memory Diagnostic Trouble Codes) IN ALL MODULES
1. Ignition ON.
2. Using a scan tool, perform all CMDTCs (Continuous Memory Diagnostic Trouble Codes) self-test.
Is DTC (Diagnostic Trouble Code) B1317, B1318, B2486, B1676, U3003:16 or U3003:17 present in one or more modules and DTC (Diagnostic Trouble Code) P0562, P0563, P0620, P0625, P0626 or P065B present in the PCM (Powertrain Control Module)?
2. CHECK THE BATTERY CONDITION
1. NOTE: DTC (Diagnostic Trouble Code) B1317, B1318, B2486, B1676, U3003:16 or U3003:17 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.
2. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.
Did the battery pass the condition test?
3. 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.
1. Start the engine.
2. Measure the 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 (Heating, Ventilation, and Air Conditioning) 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?
4. CHECK FOR VOLTAGE TO THE DSM (Driver Seat Module)
1. 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.
Ignition OFF.
2. Connect: Driver Seat Side Air Bag C3051.
3. Disconnect: DSM (Driver Seat Module) C341A and C341B.
4. Ignition ON.
5. Measure:
Are the voltages greater than 11 volts?
5. CHECK THE DSM (Driver Seat Module) GROUND CIRCUITS FOR AN OPEN
1. Ignition OFF.
2. Measure:
3. Repeat this measurement while wiggling the harness.
Are the resistances less than 3 ohms?
6. CHECK FOR CORRECT DSM (Driver Seat Module) OPERATION
1. Disconnect and inspect all DSM (Driver Seat Module) connectors.
2. Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary
3. Reconnect the DSM (Driver Seat Module) connectors. Make sure they seat and latch correctly.
4. Operate the memory seat, mirrors and pedals to verify correct memory system operation.
5. Using the scan tool, perform DSM (Driver Seat Module) self-test.
Is DTC (Diagnostic Trouble Code) B1317 or B1318 still present?
7. CHECK FOR VOLTAGE TO THE DCSM (Dual Climate Controlled Seat Module)
1. 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.
Ignition OFF.
2. Connect: Passenger Seat Side Air Bag C339.
3. Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265A.
4. Ignition ON.
5. Measure:
Are the voltages greater than 11 volts?
8. CHECK THE DCSM (Dual Climate Controlled Seat Module) GROUND CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Measure:
3. Repeat this measurement while wiggling the harness.
Is the resistance less than 3 ohms?
9. CHECK FOR CORRECT DCSM (Dual Climate Controlled Seat Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all DCSM (Dual Climate Controlled Seat Module) connectors.
3. Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary
4. Reconnect the DCSM (Dual Climate Controlled Seat Module) connectors. Make sure they seat and latch correctly.
5. Start the engine.
6. Operate the climate controlled seats and verify system operation.
7. Using a scan tool, perform DCSM (Dual Climate Controlled Seat Module) self-test.
Is DTC (Diagnostic Trouble Code) B2486 still present?
10. CHECK FOR SRS (Supplemental Restraint System) DTCs (Diagnostic Trouble Codes)
1. 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.
Ignition OFF.
2. Connect: Driver Seat Side Air Bag C3051 (if previously disconnected).
3. Connect: Passenger Seat Side Air Bag C339 (if previously disconnected).
4. Connect all other previously disconnected connectors.
5. Ignition ON.
6. Using a scan tool, clear the RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes).
7. Cycle the ignition OFF then ON.
8. Using a scan tool, perform RCM (Restraints Control Module) self-test.
Are any RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes) retrieved during self-test?
