Lexus NX: Steering Angle Sensor Communication Error (C1784)
DESCRIPTION
Steering sensor signals are sent to the absorber control ECU via CAN communication.
When there is a communication malfunction, the malfunction will be detected by the diagnosis function.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| C1784 | Steering Angle Sensor Communication Error | A steering sensor signal malfunction is detected, or a steering sensor power malfunction signal is detected for 5 seconds or more. |
| Does not come on |
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the steering sensor, confirm that the replacement part is of the correct specification.
- Before performing troubleshooting, inspect the connectors of related circuits.
-
If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.
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Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation ; 2) DTC inspection ; and 3) Techstream inspection (ECU Data List or Active Test ). If no malfunctions are found in other areas, replace the absorber control ECU.
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When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.
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PROCEDURE
| 1. | CHECK FOR DTC (CAN COMMUNICATION SYSTEM) |
(a) Check for DTCs.
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| Result | Proceed to |
|---|---|
| CAN DTC is not output | A |
| CAN DTC is output | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
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| 2. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Check for steering sensor malfunction DTCs.
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| Result | Proceed to |
|---|---|
| DTC is not output | A |
| DTC is output | B |
| A | | REPLACE ABSORBER CONTROL ECU |
| B | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) |
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Vehicle Identification Malfunction (C1789)
DESCRIPTION
When the absorber control ECU has not acquired the vehicle identification information, DTC C1789 is stored. When the vehicle identification information is correctly acquired, this DTC i
Lost Communication With TCM (U0101,U0122,U0124,U0126,U0293)
DESCRIPTION The absorber control ECU receives signals from the skid control ECU (brake booster with master cylinder assembly), steering sensor, airbag ECU assembly (built into acceleration sensor), EC
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Parts Location
PARTS LOCATION ILLUSTRATION *1 OUTER REAR VIEW MIRROR ASSEMBLY LH *2 OUTER REAR VIEW MIRROR ASSEMBLY RH *3 OUTER MIRROR LH *4 OUTER MIRROR RH *5 NO. 2 ENGINE ROOM RELAY BLOCK - DEF RELAY - ECU-B NO.2 FUSE - DEF FUSE - MIR HTR FUSE - MIRROR FUSE *6 FUSE BLOCK ASSEMBLY -
Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE BACK DOOR CENTER GARNISH Click here 2. REMOVE BACK DOOR SIDE GARNISH LH Click here 3. REMOVE BACK DOOR SIDE GARNISH RH Click here
