2003 LEXUS LS430 Combination

DTC P0979, P0980: SHIFT SOLENOID "C" CONTROL CIRCUIT LOW/HIGH (SHIFT SOLENOID
VALVE S3)
CIRCUIT DESCRIPTION
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 143: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S3 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve S3 is on, if resistance is 8ohms or less, the ECM determines there is a short
in the shift solenoid valve S3 circuit.
When the shift solenoid valve S3 is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S3 circuit (see FAIL
-SAFE CHART ).
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
Related DTCsP0979: Shift solenoid valve S3/Range check (Low
resistance) P0980: Shift solenoid valve S3/Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve S3
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone

Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 148: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S4 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve S4 is on, if resistance is 8 ohms or less, the ECM determines there is a
short in the shift solenoid valve S4 circuit.
When the shift solenoid valve S4 is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S4 circuit (see FAIL
-SAFE CHART )
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
P0982: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0982
Related DTCsP0982: Shift solenoid valve S4/Range check (Low
resistance) P0983: Shift solenoid valve S4/Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve S4
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR

c. Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid
body.
OK:
The solenoid makes an operating noise.
Fig. 152: Inspecting Shift Solenoid Valve (S4)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SHIFT SOLENOID VALVE (S4)
OK: REPAIR OR REPLACE TRANSMISSION WIRE (See step 5 on REPLACEMENT
)
DTC P0985, P0986: SHIFT SOLENOID "E" CONTROL CIRCUIT LOW/HIGH (SHIFT SOLENOID
VALVE SR)
CIRCUIT DESCRIPTION
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
Solenoid Connector (S4) - Solenoid Body (S4)11 to 15ohms

Fig. 143: Removing Rear Floor Finish Plate
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OVERHAUL
HINT:
The installation procedures are the removal procedures in reverse order. However, only installation
procedures requiring additional information are included.
A bolt without a torque specification is shown in the standard bolt chart (see STANDARD BOLT ).
1.REMOVE REAR COMBINATION LAMP SERVICE COVER LH
a. Using a screwdriver, disengage the 2 clips and remove the cover.
HINT:
Tape the screwdriver tip before use.
2.REMOVE REAR COMBINATION LAMP SERVICE COVER RH
a. Using a screwdriver, disengage the 2 clips and remove the cover.
HINT:

REPLACEMENT
HINT:
The installation procedures are the removal procedures in reverse order.
A bolt without torque specification is a standard bolt (see SPECIFIED TORQUE FOR STANDARD
BOLTS ).
1.REMOVE REAR COMBINATION LAMP SERVICE COVER RH (See OVERHAUL
)
2.REMOVE REAR COMBINATION LAMP SERVICE COVER LH (See OVERHAUL
)
3.REMOVE LUGGAGE COMPARTMENT LAMP ASSY NO. (See step 4 in OVERHAUL
)
4.REMOVE BACK DOOR TRIM COVER (See step 5 in OVERHAUL
)
5.REMOVE LUGGAGE COMPARTMENT DOOR GARNISH SUB-ASSY OUTSIDE
a. Remove the 6 nuts and key cylinder. Then remove the luggage compartment door opener switch.
b.Disengage the 4 clips and remove the garnish from the luggage compartment door.

Clock (w/ LEXUS Navigation System)
Combination Meter
Cruise Control
Door Closer (w/ Smart Key System)
Door Lock Control (w/ Smart Key System)
Dynamic Radar/Laser Cruise Control System
Electric Tension Reducer
Electronic Modulated Air Suspension
Electrically Controlled Transmission and A/T Indicator
Engine Control
Front Fog Light
Headlight
Illumination
Interior Light
Key Reminder (w/ Smart Key System)
Key Reminder (w/o Smart Key System)
LEXUS Navigation System
LEXUS Parking Assist (Clearance Sonar)
LEXUS Parking Assist (Rear View Monitor)
Luggage Compartment Door Opener and Closer
Moon Roof
Multiplex Communication System (BEAN - Instrument Panel Bus)
Multiplex Communication System (BEAN - Steering Column Bus)
PPS
Pre-Collision Safety System
Rear Air Conditioning
Seat Belt Warning
Shift Lock
Smart Key System
SRS
Taillight
Theft Deterrent (w/ Smart Key System)
Tire Pressure Warning System
TRAC
VSC
Wiper and Washer
Wireless Door Lock Control (w/ Smart Key System)
7.5AMPX-IGAdaptive Front-Lighting System
Automatic Air Conditioning (Front)
Automatic Light Control
Door Lock Control and Door Closer (w/ Smart Key System)
Door Lock Control and Door Closer (w/o Smart Key System)
Front Fog Light
Headlight
Illumination
Key Reminder (w/ Smart Key System)
Light Auto Turn Off System
Mirror Heater

FuseSystem
5AP B/ANCMultiplex Communication System (BEAN - Instrument Panel Bus)
Power Shoulder Belt Anchorage
7.5AAM2Electronically Controlled Transmission and A/T Indicator
Engine Control
Engine Immobilizer System (w/ Smart Key System) and Steering Lock
System
Engine Immobilizer System (w/o Smart Key System)
SRS
Starting and Ignition
Steering Lock System
7.5AH-LP LVLAdaptive Front-Lighting System
7.5AMPX-B1Door Lock Control and Door Closer (w/ Smart Key System)
Door Lock Control and Door Closer (w/o Smart Key System)
Engine Immobilizer System (w/ Smart Key System) and Steering Lock
System
Engine Immobilizer System (w/o Smart Key System)
Key Reminder (w/ Smart Key System)
Mirror Heater
Multiplex Communication System (BEAN - Door Bus)
Power Seat (Driver's Seat)
Power Seat (Rear Passenger's Seat)
Power Shoulder Belt Anchorage
Power Window
Remote Control Mirror
Smart Key System, Theft Deterrent, , Door Lock Control, Door Closer
and Wireless Door Lock Control (w/ Smart Key System)
Theft Deterrent (w/ Smart Key System)
Theft Deterrent (w/o Smart Key System)
Vibration Seat
Wireless Door Lock Control (w/ Smart Key System)
Wireless Door Lock Control (w/o Smart Key System)
7.5AMPX-B2ABS
Adaptive Front-Lighting System
Audio System
Automatic Air Conditioning (Front)
Charging
Clock (w/ LEXUS Navigation System)
Combination Meter
Cruise Control
Door Closer (w/ Smart Key System)
Door Lock Control (w/ Smart Key System)
Dynamic Radar/Laser Cruise Control System
Electronic Modulated Air Suspension
Electronically Controlled Transmission and A/T Indicator
Engine Control
Front Fog Light

Automatic Air Conditioning (Front)
Clock (w/ LEXUS Navigation System
Clock (w/o LEXUS Navigation System)
LEXUS Navigation System
LEXUS Parking Assist (Rear View Monitor)
Rear Air Conditioning
7.5AP-IGAutomatic Air Conditioning (Front)
Automatic Glare-Resistant EC Mirror
Climate Control Seat (Front)
Clock (w/ LEXUS Navigation System
Clock (w/o LEXUS Navigation System)
Electric Tension Reducer
Key Reminder (w/o Smart Key System)
LEXUS Navigation System
LEXUS Parking Assist (Rear View Monitor)
Moon Roof
Multiplex Communication System (BEAN - Door Bus)
Multiplex Communication System (BEAN - Instrument Panel Bus)
Rear Air Conditioning
Seat Belt Warning
Seat Heater (Front)
Wiper and Washer
7.5ARADIO NO.1Audio System
Clock (w/ LEXUS Navigation System
LEXUS Navigation System
LEXUS Parking Assist (Rear View Monitor)
7.5ASTR LOCKEngine Immobilizer System (w/ Smart Key System)
Steering Lock System
7.5ATELAudio System
Clock (w/ LEXUS Navigation System
LEXUS Navigation System
LEXUS Parking Assist (Rear View Monitor)
10ADOMEABS
Adaptive Front-Lighting System
Audio System
Automatic Air Conditioning (Front)
Charging
Clock (w/ LEXUS Navigation System)
Clock (w/o LEXUS Navigation System)
Combination Meter
Cruise Control
Door Closer (w/ Smart Key System)
Door Lock Control (w/ Smart Key System)
Dynamic Radar/Laser Cruise Control System
Electronic Modulated Air Suspension
Electronically Controlled Transmission and A/T Indicator
Engine Control