Collision Mitigation Braking System (CMBS) Symptom Troubleshooting Index (Collision Mitigation Braking System (CMBS)) (2019, 2020, 2021)

Symptom	Diagnostic procedure	Also check for
CMBS OFF switch does not turn On/turn Off (CMBS indicator does not change)	Do the gauge control module self-diagnostic function . Test the CMBS OFF switch .	An open or increased resistance in the wire A short in the wire
The MID does not indicate when the CMBS OFF switch is operated	Do the gauge control module self-diagnostic function . Test the CMBS OFF switch .	An open or increased resistance in the wire A short in the wire
The buzzer does not sound	Do the gauge control module self-diagnostic function .
The buzzer does not sound when the CMBS OFF switch is operated	Do the gauge control module self-diagnostic function .
The MID does not indicate with the CMBS operating	Do the gauge control module self-diagnostic function .
The CMBS operates frequently	Check the millimeter wave radar installation - Refer to: Collision Mitigation Braking System (CMBS) Component Location Index (2022 - 2023) or Collision Mitigation Braking System (CMBS) Component Location Index (2019 - 2021) . Check the wheel alignment .	Driving conditions, weather, environmental influence
The CMBS operated without danger of collision	Check the millimeter wave radar installation - Refer to: Collision Mitigation Braking System (CMBS) Component Location Index (2022 - 2023) or Collision Mitigation Braking System (CMBS) Component Location Index (2019 - 2021) . Check the wheel alignment .	Driving conditions, weather, environmental influence
The CMBS did not operate	Check the millimeter wave radar installation - Refer to: Collision Mitigation Braking System (CMBS) Component Location Index (2022 2023) or Collision Mitigation Braking System (CMBS) Component Location Index (2019 - 2021) . Check the wheel alignment .	Driving conditions, weather, environmental influences Undetectable environment
CMBS indicator (on the MID) does not come on	Do the gauge control module self-diagnostic function .
CMBS indicator (on the MID) does not go off	NOTE: If any of the CAN communication failure DTC is indicated in another system, troubleshoot the DTC first. Check for open wire or shorted wire in the F-CAN circuit; Between the gauge control module and the CAN gateway (F-CAN D_H, F-CAN D_L) Between the millimeter wave radar and the CAN gateway (F-CAN E_H, F-CAN E_L) Check the millimeter wave radar power circuit (IG1_VSA(VST)) Check the millimeter wave radar unit ground circuit (GND) Do the gauge control module self-diagnostic function .	Refer to the following about the indicator operating condition; How to Troubleshoot - Refer to: How to Troubleshoot the Collision Mitigation Braking System (CMBS) (2022 - 2023) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) (2019 - 2021) Refer to the followings about the circuit troubleshooting; Gauge control module connector for inputs and outputs Millimeter wave radar connector for inputs and outputs CMBS circuit diagram - Refer to: Collision Mitigation Braking System (CMBS) Circuit Diagram (2019 - 2021) or Collision Mitigation Braking System (CMBS) Circuit Diagram (2022 - 2023) Fuse to components index Ground to components index