How to Troubleshoot the Collision Mitigation Braking System (CMBS)
CMBS Indicator (Amber)
The CMBS indicator comes on when the multipurpose camera unit detects a problem in the system.

NOTE:
The ACC indicator indicates problems related with the ACC system and the CMBS.
When there is trouble to influence only a CMBS function, the ACC indicator does not come on, and only a CMBS indicator comes on.
The CMBS works with related systems such as the VSA system. If these related systems have a problem, the CMBS does not work. In this case, the CMBS indicator and the related system indicator come on.
When a problem is detected by the self-diagnostic function, the CMBS stops working, turns on the CMBS indicator, indicates the problem on the MID, and stores the DTC.
Multi-Information Display (MID) Indication
If the millimeter wave radar surface gets covered with too much debris or dirt, the multi-information display (MID) will display this icon (A), and the CMBS system will cancel its function. Check the millimeter wave radar surface for debris or dirt.

CMBS OFF Switch
Press and hold the CMBS OFF switch for at least 1 second to turn the CMBS off and on.
CMBS Indication
When the CMBS system is OK, the CMBS indicator comes on for about 5 seconds then go off after turning the vehicle to the ON mode.
When you set the CMBS to OFF, the multipurpose camera unit turns on the CMBS indicator.
When the system is activated, the MID displays a brake system warning indicator and a warning buzzer sounds.
If the system stops working because of a problem, the MID indicates the problem.
Multipurpose Camera Unit
The multipurpose camera unit controls the brakes and the various driver warnings when the system recognizes the possibility of a collision.

The multipurpose camera unit has a self-diagnostic function. If the system detects a problem, it disables the CMBS, and turns on the CMBS indicator.
Millimeter Wave Radar
The millimeter wave radar calculates the distance between the moving vehicle ahead and your vehicle, and detects the two vehicle's speed differential.
The multipurpose camera unit receives this information from the millimeter wave radar.
The millimeter wave radar also has an error detection function, and it sends a signal to the multipurpose camera unit if an error is detected.
How to Troubleshoot DTCs
Check and clear the DTCs with the HDS.

NOTE: When both ACC and CMBS indicators come on, do the ACC system troubleshooting first.

Before troubleshooting, check and note these items:
Ask the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting.
If the symptom does not appear and the CMBS indicator does not come on while test-driving, but troubleshooting is done based on the DTC, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting.
After the troubleshooting or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions as when the DTC was originally set. Make sure the CMBS indicator does not come on.
The ACC system and the CMBS may sometimes stop control because of the environment (weather, road conditions, driving conditions, etc.). A DTC may be stored in these cases.
There may be auto stop system control codes stored even when the system is OK:
NOTE: The ACC indicator will not come on, but the CMBS indicator comes on when the following codes are stored.

Code 97: CMBS Offset Cancel Timeout

Extensive driving on a rough road or turning the vehicle to the OFF (LOCK) mode when the vehicle is driving.
Intermittent Failures
The term "intermittent failure" means a system may have had a failure, but it checks OK now. If you cannot reproduce the condition, check for loose connections and terminals. Also check ground and power connections related to the circuit that you are troubleshooting.
How to Retrieve DTCs
NOTE: Make sure the 12 volt battery is fully charged before you begin.

1.

2.
Use the HDS to check for CMBS for DTCs.

3.
Read and record the DTC.

Freeze data indicates the CMBS conditions when the first system malfunction that activated the indicator was detected.
The HDS can read the DTC, the freeze data, the current data, and other system data.

4.
Turn the vehicle to the OFF (LOCK) mode.

5.
Disconnect the HDS from the DLC.

6.
Do the troubleshooting procedure for the DTC.
How to Clear DTCs
NOTE: Make sure the 12 volt battery is fully charged before you begin.

1.

2.
In the DRIVING SUPPORT MENU of the HDS, select CMBS, then DTCs choose the clear DTCs icon, and follow the prompts.

3.
Turn the vehicle to the OFF (LOCK) mode.

4.
Disconnect the HDS from the DLC.