Pinpoint Test J: DTC: B1676 - Battery Voltage Out of Range
Climate Control System
Pinpoint Tests
Pinpoint Test J: DTC: B1676 - Battery Voltage Out of Range
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
NOTE: DTC B1676 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged due to excessive load on the charging system from aftermarket accessories.
Normal Operation
Under normal operation, the HVAC module - Electronic Automatic Temperature Control (EATC) or HVAC module - Dual Automatic Temperature Control (DATC) module receives a ground through circuit GD116 (BK/VT). The HVAC module - EATC or HVAC module - DATC is supplied constant battery voltage through circuit SBP07 (WH/RD) and ignition switched voltage through circuit CBP20 (YE/VT).
- DTC B1676 Battery Voltage Out of Range- The module senses when battery voltage is less than 9 volts or greater than 16 volts.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- HVAC module - EATC module
- HVAC module - DATC module
PINPOINT TEST J: DTC: B1676 - BATTERY VOLTAGE OUT OF RANGE
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J1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Enter the following diagnostic mode on the scan tool: Self Test - All CMDTCs.
- Is B1317, B1318 or B1676 present in more than one module AND P0563, P0620, P0625, P0626 or P065B present in the PCM?
Yes
REFER to Charging System for diagnosis of the battery and charging system. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs). TEST the system for normal operation.
No
GO to J2.
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J2 CHECK BATTERY CONDITION
- 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 CMDTCs. TEST the system for normal operation.
If the battery passed the condition test and did not require a recharge, GO to J3.
No
INSTALL a new battery. CLEAR all continuous memory DTCs. TEST the system for normal operation.
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J3 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 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 J4.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.
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J4 CHECK FOR VOLTAGE MONITORING THE MODULE SUPPLY VOLTAGE (VBAT_CC) HVAC PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: VBAT_CC HVAC PID.
- Monitor the battery voltage VBAT_CC HVAC PID.
- Is the battery voltage less than 9 or greater than 15.5 volts?
Yes
If voltage is less than 9 volts, GO to J5.
If voltage is greater than 15.5 volts, INSTALL a new HVAC module. CLEAR all CMDTCs. REPEAT the self-test.
No
GO to J7.
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J5 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module - DATC C2356a or HVAC Module - EATC C228a.
- Measure the resistance between HVAC module - DATC C2356a-1 or HVAC module - EATC C228a-1, circuit GD116 (BK/VT), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to J6.
No
REPAIR circuit GD116 (BK/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J6 CHECK CIRCUITS SBP07 (WH/RD) AND CBP20 (YE/VT) FOR AN OPEN
- Ignition ON.
- Measure the voltage between HVAC module - DATC C2356a-26 or HVAC module - EATC C228a-26, circuit SBP07 (WH/RD), harness side, HVAC module - DATC C2356a-19 or HVAC module - EATC C228a-19, circuit CBP20 (YE/VT), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J7.
No
VERIFY Smart Junction Box (SJB) fuses 13 (7.5A) and 27 (7.5A) are OK. If OK, REPAIR circuit SBP07 (WH/RD) or CBP20 (YE/VT) for an open. 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.
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J7 CHECK THE MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Carry out the HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test.
- Operate the system.
- Does the concern return?
Yes
INSTALL a new HVAC module. 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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