Lexus ES: Malfunction in Deceleration Sensor (C1420)
DESCRIPTION
The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).
The skid control ECU (brake booster with master cylinder assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly) via CAN communication.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C1420 | Malfunction in Deceleration Sensor | 571 | After the difference between GL1 and GL2 is 0.6 G or more with the vehicle stopped, the difference between GL1 and GL2 does not drop below 0.4 G or more for 60 seconds or more. |
| Does not come on | ABS DTC |
CAUTION / NOTICE / HINT
NOTICE:
After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.
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PROCEDURE
| 1. | CHECK AIRBAG ECU ASSEMBLY INSTALLATION |
(a) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.
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OK:
The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.
The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.
| OK |  | REPLACE AIRBAG ECU ASSEMBLY |
| NG | | INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Before performing troubleshooting for the dynamic radar cruise control system, perform troubleshooting for the pre-collision system.
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*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. PRE-CHECK
Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during side turn signal light assembly removal/installation are shown below. Necessary Procedure After Parts R
