Cruise Control - Inop./Check PCS Message/DTC B2056/P1572
ELECTRICALEL012-06
Title:
DYNAMIC RADAR CRUISE INOPERATIVE
- "CHECK PCS" MESSAGE
Models:
'05 - '06 LS 430
November 9, 2006
Introduction
Some 2005 - 2006 model year LS 430 owners may experience a condition where the dynamic radar cruise control is inoperative, with "Check PCS" called out on the multi-information display. Diagnostic Trouble Codes (DTCs) B2056 and P1572 may also be stored. An updated cruise control computer has been made available to correct this issue.
Applicable Vehicles
^ 2006 model year LS 430 vehicles equipped with Dynamic Radar Cruise Control.
Parts Information
Warranty Information
Applicable Warranty*:
This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for 48 months or 50,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Required SSTs
Repair Procedure
1. Using the Diagnostic Tester, clear all PCS and cruise control codes.
2. Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at LEAST 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
3. Remove the No. 2 instrument panel under cover sub-assembly.
A. Detach the 4 clips and 2 claws and remove the No. 2 instrument panel under cover.
B. Disconnect the connector.
4. Using a molding remover, detach the 4 clips and remove the instrument panel garnish RH.
NOTE:
Use a screwdriver if a molding remover is NOT available. Tape the screwdriver tip before use.
5. Remove the glove compartment plate.
6. Remove the glove compartment hole cover by detaching the 6 claws.
7. Remove the glove compartment door assembly.
A. Remove the 3 bolts and 3 screws.
B. Detach the clip and remove the glove compartment door.
C. Disconnect the connectors.
8. Remove the Distance Control ECU.
A. Disconnect the ECU connector.
B. Remove the nut and Distance Control ECU.
9. Install the NEW Distance Control ECU.
A. Install the Distance Control ECU with the nut.
Torque: 5.5 N.m (56 kgf.cm, 49 ft.lbf)
B. Connect the ECU connector.
10. Install the glove compartment door assembly.
A. Connect the connectors.
B. Attach the clip to install the glove compartment door.
C. Install the 3 bolts and 3 screws.
11. Install the glove compartment hole cover by attaching the 6 claws.
12. Install the glove compartment plate.
13. Install the instrument panel garnish sub-assembly RH by attaching the 4 clips.
14. Install the No. 2 instrument panel under cover sub-assembly.
A. Connect the connector.
B. Attach the 4 clips and 2 claws to install the No. 2 instrument panel under cover.
15. Connect the cable to the negative (-) battery terminal.
16. Initialize the Distance Control ECU.
NOTE:
Be sure to perform the following steps after replacing the Distance Control ECU.
A. Turn the ignition switch to the "ON" position.
B. Push the cruise control main switch ON-OFF button ON.
C. With the brake pedal depressed, push the cruise control main switch to RESUME 3 times within 3 seconds. Check that the VSC buzzer sounds at this time.
Do NOT turn the headlight switch ON at this time because the optical axis automatic adjustment mode has already started, which could lead to incorrect optical axis adjustment.
17. Re-initialize any affected power systems.
Refer to TSIB No. PD009-06, Power System Initialization During PDS."