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Pinpoint Test T: DTC B1676




Climate Control System

Pinpoint Tests

Pinpoint Test T: DTC B1676

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

Normal Operation

Under normal operation, the HVAC module receives a ground through circuit GD133 (BK). The HVAC module is supplied constant battery voltage through circuit SBP15 (WH/RD) and ignition switched voltage through circuit CBP37 (WH).

- DTC B1676 (Battery Voltage Out of Range) - The module senses when 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 - Electronic Manual Temperature Control (EMTC)
- HVAC module - Dual Automatic Temperature Control (DATC)



PINPOINT TEST T: DTC B1676

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T1 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 T2.

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T2 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 T3.

No
INSTALL a new battery. CLEAR all CMDTCs. TEST the system for normal operation.

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T3 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 T4.

No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.

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T4 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 T5.

If voltage is greater than 15.5 volts, INSTALL a new HVAC module. CLEAR all CMDTCs. REPEAT the self-test.

No
GO to T7.

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T5 CHECK CIRCUIT GD133 (BK) FOR AN OPEN


- Ignition OFF.
- Disconnect: HVAC Module - DATC C228A or EMTC C2357A.
- Measure the resistance between HVAC module - EMTC C2357A-23 or HVAC module - DATC C228A-23, circuit GD133 (BK), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to T6.

No
REPAIR circuit GD133 (BK). TEST the system for normal operation.

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T6 CHECK CIRCUITS SBP15 (WH/RD) AND CBP37 (WH) FOR AN OPEN


- 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 and less than 16 volts?

Yes
GO to T7.

No
If DTC B1676 is present in multiple modules, refer to Charging System.
If DTC B1676 is present only in the HVAC module - EMTC or HVAC module - DATC, VERIFY Smart Junction Box (SJB) fuse 15 (10A) and fuse 37 (10A) is OK. If OK, REPAIR circuit SBP15 (WH/RD)
or CBP37 (WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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T7 CHECK THE HVAC MODULE CONNECTION


- Inspect the module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?

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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