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Auxiliary Step / Running Board




Power Running Board (PRB)

Pinpoint Test F: DTC B1317/B1318 - Battery Voltage High/Battery Voltage Low

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.

Normal Operation

The Power Running Board (PRB) module continuously monitors the input voltage for correct operation. If the PRB (Power Running Board) module detects input voltage below 9.5 volts, it will store DTC B1318 in memory. If the PRB (Power Running Board) module detects input voltage greater than 16 volts, it will store DTC B1317 in memory. If the PRB (Power Running Board) module sets DTC B1317 or B1318, it will inhibit the power liftgate system operation.

- DTC B1317 (Battery Voltage High)- If the PRB (Power Running Board) module detects voltage above 16 volts while the running boards are in motion (deploy/stow), it will set this DTC. Once this DTC is set, the PRB (Power Running Board) system will be disabled until the battery voltage returns to normal.

- DTC B1318 (Battery Voltage Low)- If the PRB (Power Running Board) module detects voltage below 9.5 volts while the running boards are in motion (deploy/stow), it will set this DTC.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- PRB (Power Running Board) module

PINPOINT TEST F : DTC B1317/B1318 - BATTERY VOLTAGE HIGH/BATTERY VOLTAGE LOW
NOTE:

Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification

F1 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 DTC B1317 or B1318 retrieved from one or more modules and P0563, P0620, P0626 or P065B retrieved from the PCM?

Yes
REFER to Charging System to diagnose the charging system. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs). REPEAT the PRB (Power Running Board) module self-test.
No
GO to F2.

F2 TEST BATTERY CONDITION

- Ignition OFF.

- Carry out the Battery Condition Test. 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 CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the PRB (Power Running Board) module self-test.

If the battery passed the condition test and did not require a recharge, GO to F3.
No
INSTALL a new battery. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the PRB (Power Running Board) module self-test.

F3 CHECK 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.

- 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 while measuring battery voltage.

- For DTC B1318, 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.







Is the voltage between 13 and 15.2 volts?

Yes
For DTC B1318, GO to F4.

For DTC B1317, GO to F6.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the PRB (Power Running Board) module self-test.

F4 CHECK THE PRB (Power Running Board) MODULE POWER CIRCUIT

- Ignition OFF.

- Disconnect: PRB (Power Running Board) module C3313B.

- Measure the voltage between PRB (Power Running Board) module C3313B-1, circuit SBB11 (BU/RD), harness side and ground.






Is the voltage greater than 10 volts?

Yes
GO to F5.
No
VERIFY Battery Junction Box (BJB) fuse 11 (30A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the PRB (Power Running Board) module self-test. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short [1][2]Diagrams By Number. CLEAR the DTCs. REPEAT the PRB (Power Running Board) module self-test.

F5 CHECK THE PRB (Power Running Board) MODULE GROUND CIRCUIT FOR AN OPEN

- Measure the resistance between PRB (Power Running Board) module C3313B-4, circuit GD139 (BK/YE), harness side and ground.






Is the resistance less than 5 ohms?

Yes
GO to F6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the PRB (Power Running Board) module self-test.

F6 CHECK FOR PRB (Power Running Board) MODULE OPERATION

- Check PRB (Power Running Board) module C3313A and C3313B for the following:
- corrosion.
- damaged pins.
- pushed-out pins.


- Connect PRB (Power Running Board) module C3313A and C3313B and make sure the connectors seat correctly.

- Clear all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

- Operate the system to verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new PRB (Power Running Board) module. REFER to Power Running Board (PRB) Module . REPEAT the PRB (Power Running Board) module self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the PRB (Power Running Board) module self-test.

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