Pinpoint Test B: DTC B1676
Anti-Lock Control
Pinpoint Test B: DTC B1676
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information Electrical Diagrams.
Normal Operation
The operating voltage required to operate the ABS module, hydraulic pump and isolation valves is in a range between 10 and 17 volts.
Fused battery voltage is supplied by the Battery Junction Box (BJB). Fused ignition voltage is also supplied by the BJB (Battery Junction Box).
- DTC B1676 (Battery Pack Voltage Out of Range)- If the voltage to the ABS module is above 16 volts or below 10 volts, DTC B1676 is set.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Charging system/vehicle battery
- ABS module
PINPOINT TEST B : DTC B1676
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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. 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
B1 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 Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC B1317, B1318 or B1676 present in one or more modules AND DTC 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 B2.
B2 CHECK BATTERY CONDITION
- Ignition OFF.
- 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. CLEAR the DTCs. REPEAT the self-test.
If the battery passed the condition test and did not require a recharge, GO to B3.
No
INSTALL a new battery. CLEAR the DTCs. REPEAT the self-test.
B3 CHECK CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 rpm while carrying out 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 carrying out this step.
- Start the engine.
- 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 B4.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). TEST the Supplemental Restraint System (SRS) for normal operation.
B4 CHECK THE VOLTAGE TO THE ABS MODULE
- Ignition OFF.
- Disconnect: ABS Module C135.
- Ignition ON.
- Measure the voltage between ground and:
- ABS module C135-1, circuit SBB69 (GY/RD), harness side.
- ABS module C135-8, circuit CBB52 (GN/WH), harness side.
- ABS module C135-32, circuit SBB68 (GN/RD), harness side.
Are the voltages greater than 10 volts?
Yes
GO to B5.
No
VERIFY BJB (Battery Junction Box) fuses 68 (60A), 69 (60A) and 52 (10A) are OK. If OK, REPAIR the affected circuit(s). If not OK, REFER to the Wiring Diagrams to identify the possible causes for the circuit short. CLEAR the DTC. REPEAT the self-test. Electrical Diagrams
B5 CHECK THE ABS MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ABS module C135-16, circuit GD120 (BK/GN), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR circuit GD120 (BK/GN). CLEAR the DTC. REPEAT the self-test.
B6 CHECK FOR CORRECT ABS MODULE OPERATION
- Check ABS module C135 for:
- corrosion
- pushed-out pins
- spread terminals
- Connect: ABS Module C135.
- Make sure the connector seats correctly, then operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) 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.