Heater Control Panel Base Sub-Assembly Replacement (BO006-04)

Publication date: 2004-09-14
Reference number: BO006-04

HEATER CONTROL PANEL BASE SUB-ASSEMBLY REPLACEMENT

TECHNICAL SERVICE BULLETIN

Reference Number(s): BO006-04, Date of Issue: September 14, 2004

LEXUS:	2002 - 2004 SC 430
SECTION:	BODY
COPYRIGHT:	© 2018 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002

INTRODUCTION

The heater control panel base sub-assembly can now be replaced without having to replace the complete Air Conditioner Control Assembly. This bulletin provides procedures for this repair.

APPLICABLE VEHICLES

2002 - 2004 model year SC 430 vehicles.

PARTS INFORMATION

Previous Part Number	Current Part Number	Part Name	Qty
N/A	55901-24020	Base Sub-assembly, Heater Control	1
N/A	55901-24030	Base Sub-assembly, Heater Control w/Electro Multi-vision	1

WARRANTY INFORMATION

OP Code	Description	Time	OFP	T1	T2
BD4013	R & R A/C Control Base Sub-assembly	0.7	55902-24050	99	99
BD4013	R & R A/C Control Base Sub-assembly	0.7	55902-24060	99	99

NOTE: 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.

COMPONENTS

Fig 1: Heater Control Panel Base Sub-Assembly Components

REPAIR PROCEDURE

CAUTION:

Disconnect the negative battery terminal and wait at least 90 seconds BEFORE performing work.
When disassembling air conditioner control assembly, measures should be taken to prevent static electricity from damaging the system.

Remove Air Conditioner Control Assembly.
1. Pull the air conditioner control assembly towards the rear of the vehicle and disengage the 6 clip fittings.
  
  Fig 2: Air Conditioner Control Assembly Clip Locations
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the 3 connectors and remove the air conditioner control assembly.
Remove Console Upper Panel Garnish Front.
1. Remove the 2 screws.
2. Disengage the 2 claw fittings and remove the console upper panel garnish from the air conditioner control assembly.
Fig 3: Removing Console Upper Panel Garnish Front
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Remove Heater Control Housing.
1. Remove the 6 screws and disengage the 4 claw fittings. Then separate the heater control housing.
  
  Fig 4: Removing Heater Control Housing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the 2 cooler wires No. 1 and remove the heater control housing.
Fig 5: Cooler Wires
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Remove Cooler Wire No. 1 (w/Lexus Navigation System).
1. Disconnect the cooler wire No. 1 from the air conditioner panel.
Fig 6: Cooler Wire No: 1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Remove Heater Control Base Sub-assembly.
1. Remove the 2 screws.
  
  Fig 7: Heater Control Base Sub-Assembly Screw Locations
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a thin flathead screwdriver with the tip taped up with protective tape, disengage the 7 claw fittings in the order shown in Fig 8.
  NOTE: Bend the film (Black) forward to insert the flathead screwdriver from underneath the base into claw fittings (4) and (7) as shown in Fig 8 and then disengage these fittings.
  
  Fig 8: Disengaging Heater Control Base Claws
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. With all the claw fittings disengaged, face the heater control base upward as shown in Fig 9.
  
  Fig 9: Facing Heating Control Upwards
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Slowly remove the heater control base.
  NOTE: If the heater control base is removed while facing down, the control knob may fall off. Be sure to install the heater control knob in the correct direction if it falls off.
  
  Fig 10: Removing Heater Control Base
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Remove Multi-display Junction Block (w/Lexus Navigation System).
1. Remove the 2 screws and the multi-display junction block from the old panel.
Fig 11: Removing Multi-Display Junction Box
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install Multi-display Junction Block (w/Lexus Navigation System).
1. Install the multi-display junction block with the 2 screws onto the new panel.
Fig 12: Installing Multi-Display Junction Box
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install Heater Control Base Sub-assembly.
1. Engage the 7 claw fittings and install the heater control base on the control switch assembly.
  CAUTION: Be careful not to damage the display.
  
  Fig 13: Installing Heater Control Base
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: Push the 2 claw fittings shown in Fig 14.
  
  Fig 14: Pushing Heater Control Base Claws For Fitting
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Install the 2 screws.
Fig 15: Heater Control Base Sub-Assembly Screw Locations
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install Cooler Wire No. 1 (w/Lexus Navigation System).
1. Connect the cooler wire No. 1 to the air conditioner panel.
Fig 16: Cooler Wire No. 1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install Heater Control Housing.
1. Connect the 2 cooler wires No. 1 to the heater control housing.
2. Push on the locking parts of the connectors to secure the cooler wires No. 1
  
  Fig 17: Locking Connector & Wire
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Engage the 4 claw fittings and install the heater control housing with the 6 screws.
Fig 18: Installing Heater Control Housing
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Reinstall Air Conditioner Control Assembly.
1. Reinstall air conditioner control assembly by engaging the 6 clip fittings.
Fig 19: Air Conditioner Assembly Clip Locations
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Function Test Unit to Confirm Switch Operation.