DESCRIPTION
The cruise control main switch is used to turn the dynamic radar cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP and CANCEL.
The SET, TAP-DOWN and - (COAST) functions, and the RES (RESUME), TAP-UP and + (ACCEL) functions are operated with the same switch. The cruise control main switch contains momentary type contacts for each function. The contacts close only while the cruise control main switch is being operated in the direction of the relative function arrow, and open when the cruise control main switch is released. The voltage at the terminal of the driving support ECU assembly changes as each of the different contacts open or close. The driving support ECU assembly reads this voltage and controls the SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL functions accordingly.
Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control main switch (ON/OFF button).
The operation of constant speed control mode is the same as that for a conventional cruise control system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.
When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
PROCEDURE
READ VALUE USING GTS
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Radar Cruise / Data List.
Read the Data List according to the display on the GTS.
Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
Cruise Control Main Switch | Cruise control main switch (ON/OFF button) status | ON or OFF | ON: Cruise control main switch (ON/OFF button) pushed OFF: Cruise control main switch (ON/OFF button) not pushed |
- |
RES/ACC Switch | +RES switch signal | ON or OFF | ON: +RES switch on OFF: +RES switch off |
- |
SET/COAST Switch | -SET switch signal | ON or OFF | ON: -SET switch on OFF: -SET switch off |
- |
Tester Display |
---|
Cruise Control Main Switch |
RES/ACC Switch |
SET/COAST Switch |
OK |
---|
The Data List items shown in the table change according to the operation of the cruise control main switch. |
Result | |||
---|---|---|---|
|
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
NG |
INSPECT CRUISE CONTROL MAIN SWITCH
Remove the cruise control main switch.
Inspect the cruise control main switch.
Result | |||
---|---|---|---|
|
NG |
REPLACE CRUISE CONTROL MAIN SWITCH Click here |
OK |
INSPECT STEERING PAD SWITCH ASSEMBLY
Remove the steering pad switch assembly.
Inspect the steering pad switch assembly.
Result | |||
---|---|---|---|
|
NG |
REPLACE STEERING PAD SWITCH ASSEMBLY Click here |
OK |
INSPECT SPIRAL CABLE SUB-ASSEMBLY
Remove the spiral cable sub-assembly.
Inspect the spiral cable sub-assembly.
Result | |||
---|---|---|---|
|
NG |
REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here |
OK |
CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY AND BODY GROUND)
Disconnect the K26 spiral cable sub-assembly connector.
Disconnect the M2 driving support ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | ||||||
---|---|---|---|---|---|---|
|
A |
REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here |
B |
REPAIR OR REPLACE HARNESS OR CONNECTOR |