| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Engine/Hybrid System | Section: Cruise Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000V1601BX |
| Title: CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Cruise Control Switch Circuit |
DESCRIPTION
The cruise control main switch operates 8 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, CANCEL, and MODE. 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 is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. The ECM then reads the voltage value that has been changed by the switch operation to control MODE, SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL. The dynamic laser cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.
- The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic laser cruise control system.
- The operation of the constant speed control mode is the same as that for a conventional cruise control system.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM |
|
(a) Connect the Techstream to the DLC3. |
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Laser Cruise / Data List.
(e) Check the Data List for proper functioning of the cruise control main switch.
ECM (Laser Cruise)
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
CCS Main SW M-CPU |
Main switch signal (Main CPU) / ON or OFF |
ON: Main switch ON OFF: Main switch OFF |
- |
|
Cancel Switch |
CANCEL switch signal / ON or OFF |
ON: CANCEL switch ON OFF: CANCEL switch OFF |
- |
|
SET/COAST Switch |
SET/COAST switch signal / ON or OFF |
ON: - (COAST)/SET switch ON OFF: - (COAST)/SET switch OFF |
- |
|
RES/ACC Switch |
RES/ACC switch signal / ON or OFF |
ON: + (ACCEL)/RES (RESUME) switch ON OFF: + (ACCEL)/RES (RESUME) switch OFF |
- |
OK:
When the cruise control main switch is operated, the display changes as shown above.
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (all items are defective) |
B |
|
NG (1 to 3 items are defective) |
C |
|
|
2. |
INSPECT CRUISE CONTROL MAIN SWITCH |
(a) Remove the cruise control main switch
.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A-1 (ECC) - A-2 (R/N) A-1 (ECC) - A-3 (CCS) |
Neutral |
10 kΩ or higher |
|
A-1 (ECC) - A-3 (CCS) |
+ (ACCEL)/RES (RESUME) |
235 to 245 Ω |
|
A-1 (ECC) - A-3 (CCS) |
- (COAST)/SET |
620 to 640 Ω |
|
A-1 (ECC) - A-3 (CCS) |
CANCEL |
1510 to 1570 Ω |
|
A-1 (ECC) - A-3 (CCS) |
Main switch on |
Below 1 Ω |
|
A-1 (ECC) - A-2 (R/N) |
Main switch on and MODE switch on |
Below 1 Ω |
|
|
3. |
INSPECT HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - SPIRAL CABLE) |
(a) Disconnect the z11connector from the spiral cable.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A-1 - z11-4 |
Always |
Below 1 Ω |
|
A-2 - z11-1 |
Always |
Below 1 Ω |
|
A-3 - z11-3 |
Always |
Below 1 Ω |
|
|
4. |
INSPECT SPIRAL CABLE |
NOTICE:
The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the page shown in the brackets.
HINT:
-
Removal
-
Installation
|
(a) Remove the spiral cable. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Condition |
Spiral Cable Position |
Specified Condition |
|---|---|---|
|
z11-1 (R/N) - H54-7 (R/N) |
Center |
Below 1 Ω |
|
2.5 rotations to the left |
||
|
2.5 rotations to the right |
||
|
z11-3 (CCS) - H54-1 (CCS) |
Center |
Below 1 Ω |
|
2.5 rotations to the left |
||
|
2.5 rotations to the right |
||
|
z11-4 (ECC) - H54-2 (ECC) |
Center |
Below 1 Ω |
|
2.5 rotations to the left |
||
|
2.5 rotations to the right |
HINT:
The spiral cable makes a maximum of approximately 5 rotations.
(c) Reinstall the spiral cable.
|
|
5. |
CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - ECM) |
(a) Disconnect the A27 connector from the ECM.
(b) Disconnect the H54 connector from the spiral cable.
|
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
(d) Reconnect the ECM and spiral cable connector.
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (for 2UZ-FE) |
B |
|
OK (for 3UR-FE) |
C |
|
|
|