DYNAMIC RADAR CRUISE CONTROL SYSTEM Cruise Control Switch Circuit

DESCRIPTION

The cruise control switch operates 8 functions: SET, COAST, TAP-DOWN, RESUME, ACCEL, TAP-UP, CANCEL and MODE. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP and ACCEL functions are operated with the same switch. The cruise control switch is an automatic return type switch which turns on only while operating it in each arrow direction and turns off after releasing it. The internal contact point of the cruise control switch is turned on with the switch operation. The driving support ECU then reads the resistance value that has been changed by the switch operation to control MODE, SET, COAST, 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.

WIRING DIAGRAM

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (CRUISE CONTROL MAIN SWITCH)

   
   

   1. Check the Data List for proper functioning of the cruise control switch Click here.

      Radar Cruise

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Cruise Control Main Switch	Cruise control switch signal (Main CPU) / ON or OFF	ON: Cruise control switch is ON OFF: Cruise control switch is OFF	-
      Cancel Switch	Cancel switch signal / ON or OFF	ON: CANCEL switch ON OFF: CANCEL switch OFF	-
      SET/COAT Switch	-/SET switch signal / ON or OFF	ON: -/SET switch ON OFF: -/SET switch OFF	-
      RES/ACC Switch	+/RES switch signal / ON or OFF	ON: +/RES switch ON OFF: +/RES switch OFF	-

      OK
      When cruise control switch operation is performed, the results are same as above.

   
   

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

2. INSPECT CRUISE CONTROL SWITCH

   
   

   1. Remove the cruise control switch Click here.

   2. Inspect the cruise control switch Click here.

   
   

   NG

   REPLACE CRUISE CONTROL SWITCH Click here

   OK

3. INSPECT SPIRAL CABLE SUB-ASSEMBLY

   
   

   1. Remove the spiral cable sub-assembly Click here.

   2. Inspect the spiral cable sub-assembly Click here.

   
   

   NG

   REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

   OK

4. INSPECT CRUISE CONTROL SWITCH WIRE

   

   *1	Front view of wire harness connector: (to Spiral Cable)
   *2	Front view of wire harness connector: (to Cruise Control Switch)

   
   

   1. Disconnect the z2 spiral cable connector.

   2. Disconnect the A cruise control switch connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition z2-3 - A-3 Always Below 1 Ω z2-4 - A-1 Always Below 1 Ω z2-1 - A-2 Always Below 1 Ω A-3 - Body ground Always 10 kΩ or higher A-1 - Body ground Always 10 kΩ or higher A-2 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPLACE CRUISE CONTROL SWITCH WIRE Click here

   OK

5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - ECU AND BODY GROUND)

   

   *1	Front view of wire harness connector: (to Spiral Cable)
   *2	Front view of wire harness connector: (to Driving Support ECU)

   
   

   1. Disconnect the L110 spiral cable connector.

   2. Disconnect the A33 ECU connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition L110-1 (CCS) - A33-27 (CCS) Always Below 1 Ω L110-8 (R/N) - A33-30 (CCHG) Always Below 1 Ω L110-2 (ECC) - Body ground Always Below 1 Ω L110-1 (CCS) - Body ground Always 10 kΩ or higher L110-8 (R/N) - Body ground Always 10 kΩ or higher

   
   

   OK

   REPLACE DRIVING SUPPORT ECU Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR