Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Diagnostic system check-engine controls".
1) Perform the body control system inspection.
Refer to "64.Body Control 10I.Troubleshooting(BCM) diagnostic system check-body controls".
Procedure completion
=>Go to Stereo camera inspection.
1) Perform the stereo camera inspection.
Refer to "75.Driver Assistance System 10W.Troubleshooting(Stereo Camera) diagnostic system check-stereo camera".
Procedure completion
=>Go to Vehicle speed set and set vehicle speed deceleration check.
1) Drive the vehicle at a speed of 50 km/h {30 mph} on a flat road.
2) Press and release the cruise control main switch.
3) Operate and release the cruise control set switch.
4) Check the vehicle maintains a speed of 50 km/h {30 mph}.
5) Tap (lightly turn) the cruise control set switch 10 times. When maintaining a set vehicle speed of 50 km/h {30 mph} and operating the cruise control set switch, is the speed decreased by 1 km/h {0.6 mph} each time?
Yes
=>Go to Set vehicle speed increase check.
No
=>Go to Cruise control prohibited conditions check.
1) Tap (lightly turn) the cruise control resume switch 10 times. When the cruise control resume switch is operated, is the speed increased by 1 km/h {0.6 mph} each time?
Yes
=>Go to Indicator light illumination check.
No
=>Go to Cruise control resume switch signal input check.
1) Check the cruise control indicator light. Does the cruise control indicator light illuminate?
Yes
=>Go to Cruise control temporary cancel check when cruise control cancel switch is operated.
No
=>Go to Communication-related DTC check.
1) Observe the DTC information for each control module with a scan tool. Is a DTC beginning with U or a DTC related to communication with other control modules set?
Yes
Go to the applicable DTC diagnosis.
No
Replace the instrument panel cluster.
Note
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster removal".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster installation".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster setting".
1) Operate the cruise control cancel switch. Is the cruise control released?
Yes
=>Go to Cruise control temporary cancel check when brake pedal is operated.
No
=>Go to Cruise control cancel switch display check.
1) Once again set the vehicle speed and operate the cruise control.
2) Operate the brake pedal. Is the cruise control released?
Yes
The system is normal.
No
Go to DTC P0571 diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0571 Brake Switch Circuit".
1) Stop the vehicle.
2) Connect the scan tool.
3) Observe the DTC information with a scan tool. If a DTC is set, is "The ECM inhibits the cruise control" described in the "Action Taken When the DTC Sets" in the item of the set DTC?
Yes
Go to the applicable DTC diagnosis.
No
=>Go to Cruise control main switch signal input check.
1) Operate the switch while observing the Cruise Main Switch parameter on the scan tool. Is ON displayed when the switch is operated and OFF when it is released?
Yes
=>Go to Cruise control set switch signal input check.
No
=>Go to Cruise control steering wheel switch inspection.
1) While observing the Cruise Set/Coast Switch parameter on the scan tool, operate the switch. Is ON displayed when the switch is operated and OFF when it is released?
Yes
Check whether the conditions for operating the cruise control system are met. Refer to cruise control operating conditions under Functional description.
No
=>Go to Cruise control steering wheel switch inspection.
1) While observing the Cruise Resume/Acceleration Switch parameter on the scan tool, operate the switch. Is ON displayed when the switch is operated and OFF when it is released?
Yes
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
No
=>Go to Cruise control steering wheel switch inspection.
1) While observing the Cruise Cancel Switch parameter on the scan tool, operate the switch. Is ON displayed when the switch is operated and OFF when it is released?
Yes
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
No
=>Go to Cruise control steering wheel switch inspection.
1) Remove the cruise control steering wheel switch.
Refer to "9.Body, Cab, Accessories 9C.Electrical Control, Entertainment cruise control steering wheel switch removal".
2) Inspect the cruise control steering wheel switch. Is the result normal?
Yes
=>Go to Inspection for open circuit and short circuit in cruise control switch signal circuit.
No
Replace the cruise control steering wheel switch.
Refer to "9.Body, Cab, Accessories 9C.Electrical Control, Entertainment cruise control steering wheel switch removal".
1) Inspect the cruise control switch signal circuit between the BCM (pins 2 and 20 of B16) and the cruise control steering wheel switch (pins 1 and 11 of B34) for the following. Is the result normal?
Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Inspection for open circuit in cruise control switch low reference circuit.
No
Repair the circuit as necessary.
1) Inspect the cruise control switch low reference circuit between the BCM (pin 19 of B16) and the cruise control steering wheel switch (pin 12 of B34) for an open circuit or high resistance. Is the result normal?
Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to BCM harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the BCM harness connector (pins 2, 19, and 20 of B16). Is the connection status normal?
Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
No
Repair the connections as necessary.
Note
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM removal".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM installation".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM setting".
Procedure completion
1) Reconnect all of the disconnected components, fuses, and harness connectors.
Procedure completion
=>Go to Vehicle speed set and set vehicle speed deceleration check.