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Heating and Air Conditioning




Climate Control System

Pinpoint Test R: DTC B1317 or B1318

NOTE: DTC B1317 or B1318 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: Carry out a thorough inspection and verification before proceeding with the pinpoint test. Refer to Inspection and Verification. Inspection and Verification

Normal Operation

Under normal operation, the Auxiliary Heater Control Module (AHCM) receives a ground through circuit GD108 (BK). The AHCM (Auxiliary Heater Control Module) is supplied constant battery voltage through circuit SDF05 (RD) and ignition switched voltage through circuit CBP37 (WH).

- DTC B1317 (Battery Voltage High)- The module senses when battery voltage is greater than 16 volts.

- DTC B1318 (Battery Voltage Low)- The module senses when battery voltage is less than 9 volts.

This pinpoint test is intended to diagnose the following:

- Fuse(s)

- Wiring, terminals or connectors

- AHCM (Auxiliary Heater Control Module)

PINPOINT TEST R : DTC B1317 OR B1318

R1 RETRIEVE ALL CMDTCs (Continuous Memory Diagnostic Trouble Codes) IN ALL MODULES

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is U3003:16, U3003:17, B1317, B1318 or B1676 present in one or more modules AND P0562, P0563, P0620, P0625, P0626 or P065B present in the PCM?

Yes
For diagnosis of the battery and charging system, REFER to Charging System.

No
GO to R2.

R2 CHECK BATTERY CONDITION

- Ignition OFF.

- and carry out the Battery- Condition Test. Pinpoint Tests

Does 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 R3.

No
INSTALL a new battery. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). TEST the system for normal operation.

R3 CHECK THE CHARGING SYSTEM VOLTAGE

NOTE: Do not allow the engine rpm 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 rpm has gone 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:
- For DTC B1317, turn off all accessories and run the engine at 1,500 rpm for a minimum of 2 minutes.

- For DTC B1318, turn on headlights and HVAC fan on high and run engine at 1,500 rpm for a minimum of 2 minutes.






Is the battery voltage between 13-15.2 volts?

Yes
GO to R4.

No
To diagnose the charging system, REFER to Charging System. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). TEST the system for normal operation.

R4 CHECK FOR VOLTAGE BY MONITORING THE SYSTEM BATTERY VOLTAGE (BATT_V) AHCM (Auxiliary Heater Control Module) PID

- Enter the following diagnostic mode on the scan tool: BATT_V AHCM (Auxiliary Heater Control Module) PID.

- With the engine running, monitor the battery voltage BATT_V AHCM (Auxiliary Heater Control Module) PID.

Doe the BATT_V AHCM (Auxiliary Heater Control Module) PID read less than 9 or greater than 15.5 volts?

Yes
If voltage is less than 9 volts, GO to R5.

If voltage is greater than 15.5 volts, INSTALL a new AHCM (Auxiliary Heater Control Module). CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.

No
GO to R7.

R5 CHECK THE AHCM (Auxiliary Heater Control Module) VOLTAGE SUPPLY CIRCUIT FOR VOLTAGE

- Ignition OFF.

- Disconnect: AHCM (Auxiliary Heater Control Module) C2463B.

- Ignition ON.

- Measure the voltage between ground and AHCM (Auxiliary Heater Control Module) C2463B-1, circuit CBP37 (WH), harness side.





Is the voltage greater 10 volts?

Yes
GO to R6.

No
REPAIR circuit CBP37 (WH) for a high resistance. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. [1][2]Diagrams By Number

R6 CHECK THE AHCM (Auxiliary Heater Control Module) GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: AHCM (Auxiliary Heater Control Module) C2463A.

- Measure the resistance between ground and AHCM (Auxiliary Heater Control Module) C2463A-1, circuit GD108 (BK), harness side.





Is the resistance less than 5 ohms?

Yes
GO to R7.

No
REPAIR circuit GD108 (BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

R7 CHECK FOR CORRECT AHCM (Auxiliary Heater Control Module) OPERATION

- Ignition OFF.

- Check the harness and component side connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.

- Connect and correctly seat all the AHCM (Auxiliary Heater Control Module) connectors.

- Operate the system and determine if the concern is still present.

Is the concern still present?

Yes
INSTALL a new AHCM (Auxiliary Heater Control Module). CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test. TEST the system for normal operation.

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