ABS/Traction Control and ABS codes C1232, 1233, 1234 and 1248

Good afternoon,

Do you have a scan tool to read live data from the sensors while driving? That will tell you which wheel or wheels are not sending any signals.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

Roy

Circuit Description
As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses the frequency of the AC signal to calculate the wheel speed.

Conditions for Running the DTC
C1221 through C1228
DTCs C1232 through C1235 are not set.
The brake pedal is not pressed.
The ABS is not active.

C1232 through C1235
The ignition is ON.

Conditions for Setting the DTC
C1221 through C1224
All of the following conditions exists for 2.5 seconds:
The suspect wheel speed equals zero.
The other wheel speeds are greater than 8 km/h (5 mph).
The other wheel speeds are within 11 km/h (7 mph) of each other.

C1225 through C1228
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 24 km/h (14.9 mph) or more in 0.01 second. The change must occur 5 times with no more than 1 second between occurrences.

C1232 through C1235
One of the following conditions exists for 0.02 seconds:
A short to voltage - the wheel speed sensor signal circuit and wheel speed sensor return circuit voltages are both greater than 4.25 volts.
A short to ground - the wheel speed sensor signal circuit and wheel speed sensor return circuit voltages are both less than 0.75 volts.
An open - the wheel speed sensor signal circuit voltage is greater than 4.25 volts and wheel speed sensor return circuit voltage is less than 0.75 volts.

Action Taken When the DTC Sets
If equipped, the following actions occur:
The EBCM disables the ABS/TCS for the duration of the ignition cycle.
The EBCM temporarily suspends the TIM monitoring function while the DTC is set.
The DRP does not function optimally.
The ABS indicator turns ON.
The Traction Off indicator turns ON.
The message center displays the Service Traction System message.

Conditions for Clearing the DTC
The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
C1221 through C1224
Under the following conditions, 2 Wheel Speed Sensor Input is 0 DTCs are set:
The 2 suspect wheel speeds equal zero for 20 seconds.
The other wheel speeds are greater than 16 km/h (10 mph).
The other wheel speeds are within 11 km/h (7 mph) of each other.
Diagnose each wheel speed sensor individually.

C1225 through C1228
A possible cause of this DTC is electrical noise on the wheel speed sensor harness wiring. Electrical noise could result from the wheel speed sensor wires being routed to close to high energy ignition system components, such as spark plug wires.

C1232 through C1235
If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:
1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl. oz. of water (10 g of salt to 200 ml. of water).
2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds.
3. If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
4. Rinse the area thoroughly when completed.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. Measures the resistance of the wheel speed sensor in order to determine if the sensor has a valid resistance value.
5. Ensures that the wheel speed sensor is generating a valid AC voltage output.

You will need a scan tool that can read the live data. See if you can borrow one or maybe have a shop just diagnose the issue for you and you can do the repair.

Roy

Okay, I attached the circuit description and flow chart below. This looks like a wiring issue with the wires to the sensor.

The sensor should have 5 volts like any other sensor in the car. I attached a diagram for you of the sensor which shows the pin number at the BCM that sends the 5 volt signal.

Roy

CIRCUIT DESCRIPTION
The body control module (BCM) uses the DRL ambient light sensor to control the automatic headlamp system. The DRL ambient light sensor is connected directly to the BCM through the DRL ambient light sensor signal circuit and the DRL ambient light sensor low reference circuit.

CONDITIONS FOR RUNNING THE DTC
The DRL feature or the automatic headlamp control feature must be enabled.

CONDITIONS FOR SETTING THE DTC
The BCM detects a short to ground in the DRL ambient light sensor signal circuit.
The condition above must be present for more than 0.3 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2647 in memory.
The SERVICE VEHICLE SOON telltale illuminates
The headlamps, park lamps, tail lamps and marker lamps will illuminate to night intensity.

CONDITIONS FOR CLEARING THE DTC
The BCM no longer detects a short to ground in the DRL ambient light sensor signal circuit.
A history DTC B2647 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

DIAGNOSTIC AIDS
If the DTC B2647 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
The following conditions may cause an intermittent malfunction to occur:
An intermittent short to ground in the DRL ambient light sensor signal circuit.
The DRL ambient light sensor is intermittently shorted to ground internally.
The BCM is intermittently shorted to ground internally.

The fact you have low voltage to the sensor tells me either the wiring or the BCM.

What was the voltage at B5 at the body control module?

Roy

Correct. If there is not 5 volts at that plug or terminal, the BCM is the issue.

Roy

They need to be programmed and I will warn you that a used BCM has about a 10% chance of taking the programming. The dealer will not even consider doing it.

The part number must be exactly the same.

Roy

Try the process again but do not wait for the 5 seconds.

At the end of the third time, it should have learned the password.

If it does not get another BCM.

Roy