DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE ON INTELLIGENT TESTER
INSPECT CRUISE CONTROL MAIN SWITCH
INSPECT SPIRAL CABLE
CHECK WIRE HARNESS (SPIRAL CABLE - ECM)
CHECK WIRE HARNESS (SPIRAL CABLE - BODY GROUND)
DYNAMIC RADAR CRUISE CONTROL SYSTEM - 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 radar 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 radar 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
| 1.READ VALUE ON INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the intelligent tester main switch on.
Check the DATA LIST for proper functioning of the cruise control main switch.
ECM (Cruise control):| Item | Measurement Item / Display (Range) | Normal Condition | Diagnostic Note |
| MAIN SW (MAIN) |
Main switch signal (Main CPU) / ON or OFF |
ON: Main switch ON (Pushed on)
OFF: Main switch OFF (Pushed off) | - |
| CANCEL SW |
CANCEL switch signal / ON or OFF |
ON: CANCEL switch ON
OFF: CANCEL switch OFF | - |
| SET/COAST SW |
SET/COAST switch signal / ON or OFF |
ON: - (COAST)/SET switch ON
OFF: - (COAST)/SET switch OFF | - |
| RES/ACC SW |
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 |
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
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| | REPLACE CRUISE CONTROL MAIN SWITCH |
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| 2.INSPECT CRUISE CONTROL MAIN SWITCH |
Disconnect the cruise control main switch connector.
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) | 216 to 264 Ω |
| A-1 (ECC) - A-3 (CCS) | - (COAST)/SET | 567 to 693 Ω |
| A-1 (ECC) - A-3 (CCS) | CANCEL | 1,386 to 1,694 Ω |
| A-1 (ECC) - A-3 (CCS) | Main Switch off | 10 kΩ or higher |
| 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 |
| | REPLACE CRUISE CONTROL MAIN SWITCH |
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- 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.
Measure the resistance according to the value(s) in the table below.
Standard resistance| Tester Condition | Spiral Cable Position | Specified Condition |
| m1-1 - J24-7 | Center | Below 1 Ω |
| 2.5 rotations to the left |
| 2.5 rotation to the right |
| m1-3 - J24-1 | Center | Below 1 Ω |
| 2.5 rotation to the left |
| 2.5 rotation to the right |
| m1-4 - J24-2 | Center | Below 1 Ω |
| 2.5 rotation to the left |
| 2.5 rotation to the right |
- The spiral cable makes a maximum of approximately 5 rotations.
| 4.CHECK WIRE HARNESS (SPIRAL CABLE - ECM) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J24-1 - A6-31 (CCS) | Always | Below 1 Ω |
| J24-7 - A5-20 (CCHG) | Always | Below 1 Ω |
| J24-1 - Body ground | Always | 10 kΩ or higher |
| J24-7 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.CHECK WIRE HARNESS (SPIRAL CABLE - BODY GROUND) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J24-2 - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
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