Symptom 2: The ICC System Cannot Be Set (ON/OFF Switch Turns On/Off)

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

The ICC cannot be set in the following cases.

When the vehicle speed is not in range of approx. 40 km/h (25 MPH) to 144 km/h (89 MPH).
When the selector lever is in "N".
While the brake is in operation.
When the windshield wipers are operating.

CHECK CAUSE OF AUTOMATIC CANCELLATION
With CONSULT-II
1. With "CAUSE OF AUTO-CANCEL" in "WORK SUPPORT" on CONSULT-II, check if any cause of cancellation exists.
OK or NG
- OK:
  - Cancel with appropriate cause.
  - For causes A, B, or C, go to specified diagnosis. .
    A: "OPE SW VOLT CIRC": Refer to "DTC 46 OPERATION SW CIRC ".
    
    B: "VHCL SPD UNMATCH": Refer to "DTC 41 VHCL SPEED SE CIRC ".
    
    C: "IGN LOW VOLT": Refer to "DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2 ".
- NG: GO TO 2.
PERFORM SELF-DIAGNOSIS
With CONSULT-II
1. Perform CONSULT-II self-diagnosis to check for malfunctioning items.
OK or NG
- OK: GO TO 3.
- NG: Repair or replace as necessary, erase DTC. Perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
CHECK SWITCHES AND VEHICLE SPEED SIGNAL
With CONSULT-II
1. With "DATA MONITOR" on the CONSULT-II, check that the following switches and vehicle speed signal operate normally.
  A: VHCL SPEED SE B: NP RANGE SW
  
  C: BRAKE SW D: SET/COAST SW
OK or NG
- OK: Replace ICC unit and erase DTC. Refer to "ICC UNIT ". Perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
- NG:
  - A: Refer to "DTC 41 VHCL SPEED SE CIRC ".
  - B: Refer to SYMPTOM 4: THE ICC SYSTEM IS NOT CANCELLED WHEN THE GEAR IS IN "N" .
  - C: Refer to "DTC 45 BRAKE SW/STOP L SW ".
  - D: Refer to "DTC 46 OPERATION SW CIRC ".