Code C1418, where is the deceleration sensor located?

Hello,

The deceleration sensor is located under the driver's seat, see image 1 below.

Did you carry out a Zero Point calibration after you replaced the ABS module?
This needs to be done to ensure the correct functioning of the system

The SST, Special Service Tool, is just another terminology for a jumper wire
The DLC3 is the OBD port where you connect the diagnostic tool.
For a layout of the DLC see image 2 below

The calibration can be done using the manual method or using a suitable diagnostic tool

CALIBRATION
DESCRIPTION
After replacing the VSC relevant components or performing "Front wheel alignment adjustment", clearing and reading the sensor calibration data are necessary.

CLEAR ZERO POINT CALIBRATION (USING SST CHECK WIRE)
HINT:

After replacing the yaw rate and deceleration sensor, make sure to clear zero point calibration data in the skid control ECU and perform zero point calibration.

Clear the zero point calibration using the SST check wire.
SST 09843-18040

Turn the ignition switch to the ON position.
Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds, for a lay out see image

Check that the warning light indicates the normal system code.
Remove the SST.

PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR (USING SST CHECK WIRE)
HINT:

After replacing the ABS & TRACTION actuator assembly, make sure to perform yaw rate sensor and deceleration sensor zero point calibration.

NOTE:
While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it and keep it in a stationary condition. (Do not start the engine.)
Be sure to perform this on a level surface (with an of inclination less than 1 degree).

Shift the shift lever to the P position.
Clear the zero point calibration.
Procedures for test mode:
Turn the ignition switch off
Apply the parking brake (Parking brake switch ON).
Using SST, connect terminals TS and CG of the DLC3.

Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position.
Turn the ignition switch to the ON position.
Keep the vehicle in the stationary condition on a level surface for 2 seconds or more.
Check that the VSC warning light blinks.
HINT:

If the VSC warning light does not blink, perform the zero point calibration again.
The zero point calibration is performed only once after the system enters the test mode.
Calibration cannot be performed again until the stored data is cleared once.

CLEAR ZERO POINT CALIBRATION (USING HAND-HELD TESTER)
HINT:

After replacing the yaw rate and deceleration sensor, make sure to clear zero point calibration data in the skid control ECU and perform zero point calibration.

Clearing the DTCs.
Connect the hand-held tester to the DLC3.
Turn the ignition switch to the ON position.
Operate the hand-held tester to erase the codes.
HINT:

Refer to the hand-held tester operator's manual for further details.

PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR (USING HAND-HELD TESTER)
NOTE:
While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it and keep it in a stationary condition. (Do not start the engine.)
Be sure to do this on a level surface (with an inclination of less than 1 degree)

Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position.
Connect the hand-held tester to the DLC3.
Turn the ignition switch to the ON position.
Operate the hand-held tester to test mode (SIGNAL CHECK).
Obtain the zero point of the yaw rate sensor and deceleration sensor:
Keep the vehicle in the stationary condition on a level surface for 2 seconds or more.
Check that the VSC warning light blinks.
HINT:

If the VSC warning light does not blink, perform the zero point calibration again.
The zero point calibration is performed only once after the system enters the test mode.
Calibration cannot be performed again until the stored data is cleared once.
Turn the ignition switch off.

Cheers, Boris