Collision Mitigation Braking System (cmbs) Acura ZDX I

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CMBS Indicator

When the system is OK, the CMBS indicator comes on for about 2 seconds after pressing the engine start/stop button to select the ON mode, then it goes off.

The CMBS indicator comes on when the ACC unit detects a problem in the system.

Note. The ACC indicator indicates problems related with the ACC system and the CMBS. The CMBS indicator only indicates its system problems. The CMBS works with related systems such as the VSA system. If these related systems have a problem, the CMBS does not operate. In this case, the CMBS indicator and the related system indicator come on.

Scheme 79

When a problem is detected by the self-diagnostic function, the CMBS stops operating, turns on the CMBS indicator, indicates the problem on the MID, and stores the DTC.

CMBS OFF Switch

Press and hold the CMBS OFF switch for at least 1 second to turn the CMBS off and on.

CMBS Indication

1. When the system is OK, the CMBS indicator comes on for 2 seconds after press the engine start/stop button to select the ON mode with the CMBS OFF switch on.
2. When the system is activated, the word BRAKE is indicated on the MID and the warning buzzer sounds. First stage, BRAKE indicator and buzzer Second stage, BRAKE indicator, buzzer, light braking, and light seat belt tension Third stage, BRAKE indicator, buzzer, strong braking, and strong seat belt tension
3. If the system stops operating because of a problem, the MID indicates the problem.

ACC Unit

The ACC unit controls the brakes and the various driver warnings when the system recognizes the possibility of a collision.

The ACC unit has a self-diagnostic function. If the system detects a problem, it stops the CMBS, and turns on the CMBS indicator.

CMBS Initial Check

The ACC unit turns on the CMBS indicator if the CMBS initial check is not completed.

Note. For proper CMBS operation, if the ACC unit or the VSA modulator-control unit is replaced, do the CMBS initial check incomplete troubleshooting (DTC 100) (see DTC 100: CMBS INITIAL CHECK INCOMPLETE ).

Millimeter Wave Radar

The millimeter wave radar calculates the distance between the moving vehicle ahead and your vehicle, and detects the two vehicles' speed differential.

The ACC 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 ACC unit if an error is detected.

How to Troubleshoot DTCs

Check and clear the DTCs with the HDS.

Note. When both the ACC and CMBS indicators come on, do the ACC system troubleshooting first (except DTC 100).

Before troubleshooting, check and note these items

1. Ask the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting.
2. If the symptom does not appear and the CMBS indicator does not come on during the test-drive, 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.
3. 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.
4. 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.

DTCs may be stored even when the system is OK

Note. The ACC indicator will not come on, but the CMBS indicator does come on when the following DTCs are stored.

DTC 88: Millimeter Wave Radar Out of Detection Condition

The millimeter wave radar overheats, the power supply voltage for the millimeter wave radar is low, or there is a communication error between the ACC unit and the millimeter wave radar.

DTC 95: Power Supply Voltage Too High; DTC 96: Power Supply Voltage Too Low; DTC 97: CMBS Offset Cancel Timeout

Extensive driving on a rough road or the pressing the engine start/stop button to select the OFF mode when the vehicle is driving.

DTC 102: CMBS Parking Brake Incomplete Releasing

Parking brake not fully released, or driving with the parking brake stuck.

How to Retrieve DTCs

Note. Make sure the battery is fully charged before you begin.

Scheme 80

1. Press the engine start/stop button to select the OFF mode.
2. Connect the HDS (Honda Diagnostic System) to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Press the engine start/stop button to select the ON mode.
4. Make sure the HDS communicates with the vehicle and the ACC unit. If it does not communicate, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
5. Use the HDS to check for CMBS DTCs.
6. Read and record the DTC.
7. Press the engine start/stop button to select the OFF mode, then wait for 10 seconds.
8. Disconnect the HDS from the DLC.
9. Do the troubleshooting procedure for the DTC.

How to Clear DTCs

Note. Make sure the battery is fully charged before you begin.

Scheme 81

1. Press the engine start/stop button to select the OFF mode.
2. Connect the HDS (Honda Diagnostic System) to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Press the engine start/stop button to select the ON mode.
4. Make sure the HDS communicates with the vehicle and the ACC unit. If it does not communicate, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
5. In the DRIVING SUPPORT MENU of the HDS, select ACC, then DTCs choose the clear DTCs icon, and follow the prompts.
6. Press the engine start/stop button to select the OFF mode, then wait for 10 seconds.
7. Disconnect the HDS from the DLC.

DTC Troubleshooting Index

Symptom Troubleshooting Index

System Description

The collision mitigation braking system (CMBS) anticipates collisions and assists brake operation to reduce the impact on occupants and vehicle damage. The system works in combination with the E-pretensioners, which retract the seat belts in anticipation of impact.

CMBS Operation

1. Warnings are both audible (warning buzzer) and visual (MID)
2. Evasive action support and collision speed reduction by brake control

(1) Approaching a vehicle ahead: The CMBS warns the driver by a MID indication twice, after that it warns by a MID indication and buzzer sound. (2) Closer to vehicle ahead: Warning by a MID indication and buzzer sound. CMBS aids perception and evasive action by using the sensory warning of light braking and light seat belt tension. (3) Collision unavoidable: Warnings by a MID indication and buzzer sound. CMBS reduces collision speed to mitigate damage and applies strong seat belt tension to reduce injuries

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Main Functions of CMBS

1. When a collision is about to happen and the relative speed (the speed difference from the object ahead) is greater than 9 mph (15 km/h), the system provides warnings (audible and visual) and brake control.
2. When approaching a object ahead and the distance to the vehicle is very close, the system provides the collision warning (First stage) by MID indication and buzzer sounding.
3. When the closing distance continues to decrease and there is a high risk of collision, the system applies light braking and light seat belt tension (Second stage) with the first stage warning.
4. When the system judges that a collision is imminent, the system activates emergency brake control and applies strong seat belt tension (Third stage) with the first stage.

CMBS Control

The CMBS is operated by the ACC unit. The CMBS has the following functions

Obstacle Determination Function

The system determines the potential for collision by the distance from the vehicle ahead and the relative speed based on the millimeter wave radar and the predictable course calculated by the driving conditions (wheel speed and yaw rate).

Warning Function

When there is a high risk of collision, the system sends warning directions to the gauge control module and warns by both audible and visual means.

Brake Control Function

When there is a high risk of collision, the system sends brake directions to the VSA modulator-control unit and controls braking action.

CMBS Activation Conditions

The system might activate (warn the driver, apply the brakes) when it detects or encounters these situations

1. Metallic projections on the road
2. Metallic manhole and drain covers
3. Signs and guardrails ahead
4. Low overpasses and narrow gates
5. Approaching vehicles that are turning left or right
6. Passing slower vehicles ahead

The system might not activate (no warning or intervention) when it detects or encounters these situations

1. Low-speed, heavy traffic (such as in a traffic jam)
2. Being cut-off by a slower vehicle
3. Approaching a vehicle stopped at an angle
4. Driving on curves
5. Approaching a bicycle or moped
6. Dirt or snow stuck on the front grille radar cover
7. Heavy rain or snow

When the CMBS activates, it sounds and feels just like ABS activation.

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DTC 20: Steering Angle Sensor Malfunction

Note. Before doing this troubleshooting procedure, check the steering angle sensor installation (see STEERING ANGLE SENSOR REPLACEMENT ).

1. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). Are any DTCs indicated? YES -Troubleshoot the indicated VSA system DTC(s). NO -Go to step 2.
2. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
3. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
4. Turn the steering wheel from lock to lock several times.
5. Check for DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ). Is DTC 20 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
6. Check the CALIBRATION STATUS OF STEERING ANGLE SENSOR in the ACC DATA LIST with the HDS. Is NOT COMPLETE indicated? YES -Do the VSA sensor neutral position memorization (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__yaw-rate-acceleration-sensor-replacement) ). NO -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ).

DTC 26: Steering Angle Sensor Adherence Failure

Note. Before doing this troubleshooting procedure, check the steering angle sensor installation (see STEERING ANGLE SENSOR REPLACEMENT ).

1. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). Are any DTCs indicated? YES -Troubleshoot the indicated VSA system DTC(s). NO -Go to step 2.
2. Check the STEERING ANGLE in the ACC DATA LIST with the HDS, turn the steering wheel from lock to lock. Do any value change? YES -Check for loose or poor connections. If OK, update the ACC unit (see «ACC UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__acc-unit-update) ), then recheck. If the ACC unit was already updated, replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ). NO -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ).

DTC 34: Master Cylinder Brake Fluid Pressure Sensor Circuit Open/Short; DTC 35: Master Cylinder Brake Fluid Pressure Sensor Center Position Error; DTC 36: Master Cylinder Brake Fluid Pressure Sensor Shift Error

1. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). Are any DTCs indicated? YES -Troubleshoot the indicated VSA system DTC(s). NO -Go to step 2.
2. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
3. Watch the CMBS indicator. Does the CMBS indicator go off? YES -Intermittent failure, the system is OK at this time. Check for loose or poor connections. NO -Go to step 4.
4. Press the brake pedal.
5. Watch the CMBS indicator. Does the CMBS indicator go off? YES -Intermittent failure, the system is OK at this time. Check for loose or poor connections. NO -Go to step 6.
6. Check for DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ). Is DTC 34, 35, or 36 indicated? YES -Go to step 7. NO -Troubleshoot the indicated DTC(s).
7. With the brake pedal released, check the master cylinder brake fluid pressure voltage (BRAKE P) with the HDS. Is there about 0.5 V? YES -Go to step 8. NO -Go to the VSA system troubleshooting (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
8. Test the brake booster (see «MASTER CYLINDER INSPECTION»(/acura/zdx/i-2009-2013/remont/mechanical-hydraulic/#conventional-brake-system) ).
9. Start the engine, then press the brake pedal with about 314 N (32.0 kgf, 70.6 lbf) pressure.
10. Check the master cylinder brake fluid pressure voltage (BRAKE P) with the HDS. Is there about 2.5 V? YES -Go to step 11. NO -Go to the VSA system troubleshooting (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ).
11. Check the BRAKE SW (N.O.) in the ACC DATA LIST with the HDS. Does the indication show ON when the brake pedal is pressed, and show OFF when the brake pedal is released? YES -Check for loose or poor connections. If OK, update the ACC unit (see «ACC UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__acc-unit-update) ), then recheck. If the ACC unit was already updated, replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ). NO -Go to step 12.
12. Check for DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ). Is DTC 60, 110, or 111 indicated? YES -Troubleshoot the indicated DTC(s). NO -Troubleshoot the brake pedal position switch signal circuit (see «BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system) ).

DTC 64: CMBS Operation Error (Excessive Operation)

Note. If the CMBS operates frequently, DTC 64 is stored.

1. Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/exterior-body-panels/#bumpers__front-bumper-removalinstallation) ).
2. Inspect the frame for warpage, and check the installation of the millimeter wave radar and the main bracket. Is the installation and the frame OK? YES -Go to step 3. NO -Reinstall the components correctly, or replace if damaged, then go to step 3.
3. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
4. Aim the millimeter wave radar (see «MILLIMETER WAVE RADAR AIMING»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ).
5. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
6. Press the MAIN switch ON.
7. Watch the CMBS indicators. Does the CMBS indicator come on? YES -Go to step 8. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
8. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
9. Watch the CMBS indicator. Does the CMBS indicator come on? YES -Go to step 10. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
10. Check for DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ). Is DTC 64 indicated? YES -Check for loose or poor connections. If OK, update the ACC unit (see «ACC UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__acc-unit-update) ), then recheck. If the ACC unit was already updated, replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ). NO -Troubleshoot the indicated DTC(s).

DTC 100: CMBS Initial Check Incomplete

Note. The CMBS initial check function checks the communication between the ACC unit and the VSA modulator-control unit.

If the CMBS initial check is incomplete, the ACC and CMBS indicators come on. For the CMBS to operate properly, always do the CMBS initial check after replacing the ACC unit or the VSA modulator-control unit.

1. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
2. Watch the VSA indicator. Does the VSA indicator come on? YES -Go to the VSA system troubleshooting (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). NO -Go to step 3.
3. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). Are any DTCs indicated? YES -Troubleshoot the indicated VSA system DTC(s). NO -Go to step 4.
4. Start the engine.
5. Select CMBS from the DRIVING SUPPORT menu, then enter the MISCELLANEOUS TEST.
6. Do the CMBS brake forced operation.
7. Watch the ACC and CMBS indicators. Do both indicators come on? YES -Go to step 8. NO -The system is OK at this time. The CMBS initial check is complete.
8. Check for ACC system DTCs with the HDS (see «HOW TO RETRIEVE DTCS»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__how-to-retrieve-dtcs) ). Are any DTCs except DTC 100 indicated? YES -Troubleshoot the indicated DTC(s). NO -Check for loose or poor connections. If OK, update the ACC unit (see «ACC UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__acc-unit-update) ), then recheck. If the ACC unit was already updated, replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ).

DTC 103: CMBS Brake Control Prohibition

1. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). Are any DTCs indicated? YES -Troubleshoot the indicated VSA system DTC(s). NO -Go to step 2.
2. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
3. Watch the CMBS indicator. Does the CMBS indicator come on? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
4. Check for ACC system DTCs with the HDS (see «HOW TO RETRIEVE DTCS»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__how-to-retrieve-dtcs) ). Is DTC 103 indicated? YES -Check for loose or poor connections. If OK, update the ACC unit (see «ACC UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__acc-unit-update) ), then recheck. If the ACC unit was already updated, replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ). NO -Troubleshoot the indicated DTC(s).

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1. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
2. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
3. Check for DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ). Is DTC 117 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
4. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#vsa-system-components) ). Are any DTCs indicated? YES -Troubleshoot the indicated VSA system DTC(s). NO -Go to step 5.
5. Press the engine start/stop button to select the OFF mode.
6. Disconnect the steering angle sensor 5P connector.
7. Disconnect the ACC unit 20P connector.
8. Check for continuity between ACC unit 20P connector terminal No. 10 and steering angle sensor 5P connector terminal No. 4, and between ACC unit 20P connector terminal No. 20 and steering angle sensor 5P connector terminals No. 2. Is there continuity? YES -Check for loose or poor connections. If OK, update the ACC unit (see «ACC UNIT UPDATE»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc__acc-unit-update) ), then recheck. If the ACC unit was already updated, replace the ACC unit (see «ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/cruise-control-systems/#adaptive-cruise-control-acc) ). NO -Repair an open in the wire between the ACC unit and the steering angle sensor.

CMBS indicator does not go off

1. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
2. Press and hold the CMBS OFF switch for at least 1 second to turn off the system.
3. Watch the CMBS indicator. Does the CMBS indicator go off? YES -The system is OK at this time. NO -Go to step 4.
4. Clear the DTCs with the HDS (see «HOW TO CLEAR DTCS»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs__how-to-clear-dtcs) ).
5. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
6. Check for the ACC system, VSA, and PCM DTCs with the HDS. Are any DTCs indicated? YES -Troubleshoot the indicated DTC(s). NO -Go to step 7.
7. Start the engine, and wait for 2 seconds.
8. Watch the CMBS indicator. Does the CMBS indicator go off? YES -The system is OK at this time. NO -Go to step 9.
9. Stop the engine.
10. Check for ACC system DTCs with the HDS. Are any DTCs indicated? YES -Troubleshoot the indicated DTC(s). NO -Test the CMBS OFF switch (built-in to the multi switch) (see «CMBS OFF SWITCH TEST/REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/anti-locktraction-control/#collision-mitigation-braking-system-cmbs) ). If the switch is OK, do the gauge control module self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ).

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1. Remove the driver's outer dashboard trim (see «DRIVER'S OUTER DASHBOARD TRIM REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ).
2. Remove the multi switch (built-in CMBS OFF switch) (A), then disconnect the multi switch 12P connector (B) and the power mirror switch 13P connector (C).
3. On the switch side, check for continuity between the multi switch 12P connector terminal in each switch position according to the table.
4. If the continuity is not as specified, remove the power mirror switch (A), then replace the multi switch (built-in CMBS OFF switch) (B).
5. Install the multi switch (built-in CMBS Off switch) in the reverse order of removal.

See also:
• DLC CIRCUIT TROUBLESHOOTING
• DTC TROUBLESHOOTING
• DTC 12: RIGHT REAR WHEEL SPEED SENSOR SIGNAL ERROR
• DTC 14: RIGHT FRONT WHEEL SPEED SENSOR SIGNAL ERROR
• DTC 23: YAW RATE-ACCELERATION SENSOR GAIN ERROR
• DTC 24 YAW RATE-ACCELERATION SENSOR DIAGNOSIS MALFUNCTION
• DTC 25: YAW RATE-ACCELERATION SENSOR STABILIZING MALFUNCTION
• DTC 62: MILLIMETER WAVE RADAR SENSOR ERROR
• DTC 105: DUST OR DIRT ON THE MILLIMETER WAVE RADAR
• DTC 199: ACC UNIT PROGRAMMING ERROR
• SELF-DIAGNOSTIC FUNCTION
• STEERING ANGLE SENSOR REPLACEMENT
• GENERAL TROUBLESHOOTING INFORMATION
• YAW RATE-ACCELERATION SENSOR REPLACEMENT
• ACC UNIT UPDATE
• MASTER CYLINDER INSPECTION
• BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING
• FRONT BUMPER REMOVAL/INSTALLATION
• HOW TO RETRIEVE DTCS
• DRIVER'S OUTER DASHBOARD TRIM REMOVAL/INSTALLATION
• DTC 100: CMBS INITIAL CHECK INCOMPLETE
• 20
• 26
• 34
• 64
• 88
• 95
• 96
• 102
• 103
• 117
• CMBS INDICATOR DOES NOT GO OFF
• HOW TO CLEAR DTCS