Canada - Restraint System - SRS Light ON DTC's B1861/B1866
BulletinTSB2750
Issue Date
January 26, 2010
Title
SRS LIGHT "ON" DTC B1861/B1866
Component
ELECTRICAL
Models
'07-'09 LS460; '08-'09 LS600h
INTRODUCTION:
Some 2007 - 2009 model year LS 460/460L and 2008 - 2009 model year LS 600h vehicles may exhibit an SRS light "ON" condition with DTC B1861 and/or B1866. Use the following repair procedure to address this concern.
TSB OVERVIEW:
After confirming the vehicle condition matches this bulletin, this TSB will direct you to replace the instrument panel wire harness. In order to do this, it is necessary to first remove several major components, such as the upper instrument panel, steering column, instrument panel reinforcement assembly, and the air conditioning unit. This bulletin provides detailed instructions on the removal and installation of these components.
APPLICABILITY:
PRODUCTION CHANGE INFORMATION:
This TSB applies to vehicles produced BEFORE the Production Change Effective VIN shown.
WARRANTY INFORMATION:
PARTS INFORMATION:
REQUIRED TOOLS & EQUIPMENT:
DIAGNOSTIC PROCEDURE: DTC B1861/B1866
1. Using Techstream, confirm that DTC B1861 or B1866 is present or in history.
2. Disconnect the negative (-) battery terminal.
CAUTION
Work must be started more than 90 seconds AFTER the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected from the battery. (The SRS is equipped with a back-up power source. If work is started within 90 seconds from disconnecting the negative (-) terminal cable of the battery, the SRS may deploy.)
3. Disconnect the knee airbag squib.
Refer to the Repair Manual within E-TAS / TIS library:
DTC B1861 (driver side):
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Supplemental Restraint Systems
- Keyword: Supplemental Restraint System: Driver Side Knee Airbag Assembly: Removal
DTC B1866 (front passenger side):
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Supplemental Restraint Systems
- Keyword: Supplemental Restraint System: Front Passenger Side Knee Airbag Assembly: Removal
4. Connect the knee airbag squib.
5. Connect the negative (-) battery terminal.
6. Turn the engine switch (IG) ON and wait at least 60 seconds.
7. Clear the DTCs stored in memory.
8. Turn the engine switch (IG) OFF.
9. Turn the engine switch (IG) ON and wait at least 60 seconds.
10. Check for SRS DTCs.
A. If DTC B1861 or B1866 is present, refer to the Repair Manual within E-TAS / TIS library:
DTC B1861 (driver side):
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Supplemental Restraint Systems
- Keyword: Supplemental Restraint System: Airbag System: B1860/64-B1863/64: Short in Driver Side Knee Airbag Squib Circuit "(reference DTC B1861:" Open in Driver Side Knee Airbag Squib Circuit )
DTC B1866 (front passenger side):
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Supplemental Restraint Systems
- Keyword: Supplemental Restraint System: Airbag System: B1865/65-B1868/65: Short in Front Passenger Side Knee Airbag Squib Circuit "(reference DTC B1866:" Open in Front Passenger Side Knee Airbag Squib Circuit )
B. If DTC B1861 or B1866 is no longer present, replace the instrument panel wire harness.
INSTRUMENT PANEL WIRE HARNESS PART NUMBER IDENTIFICATION
To order the correct part, locate the part number on the harness near the connector for the passenger side knee airbag assembly. To access the part tag, remove the passenger side knee airbag assembly.
Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Supplemental Restraint Systems
- Keyword: Supplemental Restraint System: Front Passenger Side Knee Airbag Assembly: Removal
REPAIR PROCEDURE:INSTRUMENT PANEL WIRE HARNESS REPLACEMENT
NOTE
In order to replace the instrument panel wire harness, the air conditioning unit must be removed.
1. Remove the air conditioning unit.
NOTE
Removing the air conditioning unit will include removing the upper instrument panel, steering column, and the instrument panel reinforcement.
Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Heating/Air Conditioning
- Keyword: Air Conditioning: Air Conditioning Unit (for Front Side): Removal
2. Remove the instrument panel wire harness.
3. Install the NEW instrument panel wire harness.
4. Install the air conditioning unit.
Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: LS460/ 460L/ 600hL
- Year: Applicable Year
- Service Category: Vehicle Interior
- Section: Heating/Air Conditioning
- Keyword: Air Conditioning: Air Conditioning Unit (for Front Side): Installation
5. Clear all DTCs and initialize affected power systems.
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.