Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Assist Map Number Un-Writing (C1581)
DESCRIPTION
This DTC will be stored if the power steering ECU assembly determines that the assist map is not written in the ECU.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1581 | Assist Map Number Un-Writing | Assist map not written in power steering ECU assembly |
| EPS warning light: Comes on | Assist Map Writing is performed or the power switch is turned on (IG) again | - |
CAUTION / NOTICE / HINT
NOTICE:
If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
Click here .gif)
HINT:
Related parts store information necessary for assist map writing.
Related Part:
- ECM
- Main body ECU (Multiplex network body ECU)
- Skid control ECU (Brake actuator assembly)
PROCEDURE
| 1. | PERFORM ASSIST MAP WRITING |
(a) Perform assist map writing.
Click here
| Tester Display |
|---|
| Signal Check |
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTC C1581 is output. | A |
| DTC C1581 is not output. | B |
NOTICE:
DTC C1581 is cleared after the assist map is written.
| B | .gif) | END |
|
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| 2. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output. | A |
| CAN communication system DTCs are output. | B |
| B | | GO TO CAN COMMUNICATION SYSTEM |
|
| 3. | CHECK RELATED PART |
(a) Confirm if the related part has the correct part number.
| Related Part | ECM |
| Main body ECU (Multiplex network body ECU) | |
| Skid control ECU (Brake actuator assembly) |
NOTICE:
When removing the related part to check it, be sure to follow the appropriate procedures and precautions.
-
ECM
Click here
-
Main body ECU (Multiplex network body ECU)
Click here
-
Skid control ECU (Brake actuator assembly)
Click here
| Result | Proceed to |
|---|---|
| The related part has the correct part number. | A |
| The related part has an incorrect part number. | B |
| B | | GO TO STEP 5 |
|
| 4. | CHECK FOR DTC |
(a) Select Health Check on the Techstream screen and check if system DTCs of the related part are output.
HINT:
If system DTCs of the related part are stored, assist map writing to the power steering ECU assembly may not be performed properly.
| Result | Proceed to |
|---|---|
| System DTCs of the related part are output. | A |
| System DTCs of the related part are not output. | B |
| A | | REPAIR CIRCUIT INDICATED BY OUTPUT CODE |
| B | | REPLACE POWER STEERING ECU ASSEMBLY |
| 5. | REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER |
(a) Replace the related part with one that has the correct part number.
-
ECM
Click here
-
Main body ECU (Multiplex network body ECU)
Click here
-
Skid control ECU (Brake actuator assembly)
Click here
|
| 6. | CHECK FOR DTC |
(a) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| A | | END |
| B | | REPLACE POWER STEERING ECU ASSEMBLY |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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