Pinpoint Test X: DTC B1317 Or B1318
Climate Control System
Pinpoint Tests
Pinpoint Test X: DTC B1317 or B1318
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
NOTE: DTCs 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 HVAC module receives a ground through circuit GD111 (BK/BU). The HVAC module is supplied constant battery voltage through circuit SBP15 (WH/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:
- Wiring, terminals or connectors
- HVAC module - Electronic Manual Temperature Control (EMTC)
- HVAC module - Dual Automatic Temperature Control (DATC)
PINPOINT TEST X: DTC B1317 OR B1318
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X1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - All CMDTCs.
- Is B1317, B1318 or B1676 present in one or more modules AND P0563, P0620, P0625, P0626 or P065B present in the PCM?
Yes
REFER to Charging System for diagnosis of the battery and charging system.
No
GO to X2.
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X2 CHECK BATTERY CONDITION
- Ignition OFF.
- Refer to Battery 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 X3.
No
INSTALL a new battery. CLEAR all continuous memory DTCs. TEST the system for normal operation.
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X3 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
For DTC B1318, GO to X4.
For DTC B1317, INSTALL a new HVAC module - DATC. CLEAR all CMDTCs. REPEAT the self test.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.
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X4 CHECK CIRCUITS SBP15 (WH/RD) AND CBP37 (WH) FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module - DATC C228a or EMTC C2357a.
- Ignition ON.
- With the engine running, measure the voltage between HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side, HVAC module - EMTC C2357a-12 or HVAC module - DATC C228a-12, circuit CBP37 (WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to X5.
No
VERIFY Smart Junction Box (SJB) fuse 15 (10A) and fuse 37 (10A) are OK. If OK, REPAIR circuit SBP15 (WH/RD) or CBP37 (WH) for an open. CLEAR all CMDTCs. REPEAT the self test. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short.
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X5 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and ground.
- Repeat this measurement while wiggling the harness.
- Is the resistance less than 5 ohms?
Yes
GO to X6.
No
REPAIR circuit GD111 (BK/BU) for an open. TEST the system for normal operation.
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X6 CHECK MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Alternate Diagnostic Methods - HVAC Module - Dual Automatic Temperature Control (DATC) Only
- Operate the system.
- Does the concern return?
Yes
INSTALL a new HVAC module - DATC. 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 the DTCs. REPEAT the self test. TEST the system for normal operation.
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