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 |
Error in Matching of ECUs (C1567)
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Assist Map Number Mismatch (C1582)
DESCRIPTION When an incorrect ECM, main body ECU (multiplex network body ECU) or skid control ECU (brake actuator assembly) is installed after the assist map has been written to the power steering ECU ...
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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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