Pinpoint Test H: DTCs B1317 and B1318
Seats
Pinpoint Tests
Pinpoint Test H: DTCs B1317 and B1318
Refer to Wiring Diagram Set 123, Memory Seats for schematic and connector information. Diagrams By Number
Normal Operation
Battery voltage is supplied to Driver Seat Module (DSM) circuits SBB45 (GY/RD) and SBP12 (GN/RD). Ground is supplied to DSM circuits GD179 (BK/VT) and GD133 (BK). The DSM continuously monitors the input voltage for correct operation. If the DSM detects input voltage below 10 volts, it will store DTC B1318 in memory. If the DSM detects input voltage above 15 volts, it will store DTC B1317 in memory. If DTC B1317 or B1318 is set, the DSM disables the memory system outputs for the driver seat, exterior mirrors and adjustable pedal operation.
- DTC B1317 (Battery Voltage High) - If the DSM detects voltage above 15 volts, the DTC is set.
- DTC B1318 (Battery Voltage Low) - If the DSM detects voltage below 10 volts, the DTC is set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- DSM
PINPOINT TEST H: DTCs B1317 AND B1318
NOTE: DTCs B1317, B1318 and 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.
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H1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - All CMDTCs.
- Is DTC B1317, B1318 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 H2.
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H2 CHECK BATTERY CONDITION
- Ignition OFF.
- Carry out the Battery Condition Test. Refer to Battery. 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 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 H3.
No
INSTALL a new battery. CLEAR all CMDTCs. TEST the system for normal operation.
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H3 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 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 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 H4.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.
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H4 CHECK THE VOLTAGE TO THE DSM
- Ignition OFF.
- Disconnect: DSM C341A and C341B.
- Ignition ON.
- Measure the voltage between DSM C341A-1, circuit SBB45 (GY/RD), harness side and ground.
- Measure the voltage between DSM C341B-1, circuit SBP12 (GN/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to H5.
No
VERIFY Battery Junction Box (BJB) fuse 45 (30A) and Smart Junction Box (SJB) fuse 12 (7.5A) are 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
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H5 CHECK CIRCUITS GD179 (BK/VT) AND GD133 (BK) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between:
- DSM C341A-2, circuit GD179 (BK/VT), harness side and ground.
- DSM C341B-24, circuit GD133 (BK), harness side and ground.
- Repeat this measurement while wiggling the harness.
- Are the resistances less than 5 ohms?
Yes
GO to H6.
No
REPAIR the circuit. CLEAR all CMDTCs. REPEAT the self-test.
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H6 CHECK FOR CORRECT DSM OPERATION
- Check the harness and component side connectors for the following:
- corrosion.
- damaged pins.
- pushed-out pins.
- Connect: DSM C341A and C341B.
- Make sure the DSM connectors are seated correctly.
- Operate the memory seat, mirrors and pedals to verify correct memory system operation.
- Enter the following diagnostic mode on the scan tool: Self Test - DSM.
- Is DTC B1317 or B1318 still present?
Yes
INSTALL a new DSM. REFER to Body Control Systems. 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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