Suspension Stroke Sensor Circuit Troubleshooting

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Before troubleshooting, make sure the No. D21 (7.5 A) fuse in the passenger's under-dash fuse/relay box is OK.
Before troubleshooting, check for DTCs and make sure the B-CAN communication lines are OK.

Raise the vehicle, make sure it is securely supported.
Disconnect the 3P connector (A) from the front suspension stroke sensor (B).

Fig 1: Identifying Front Suspension Stroke Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the 3P connector (A) from the rear suspension stroke sensor (B).

Fig 2: Identifying Rear Suspension Stroke Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Turn the combination light (headlight) switch ON.
Individually check for continuity between front and rear suspension stroke sensors 3P connector terminal No. 1 and body ground.

Fig 3: Checking Continuity Between Front And Rear Suspension Stroke Sensors 3P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 7.

NO -Repair an open in the wire or poor ground (G403), if the wire is OK, replace the headlight leveling control unit (see HEADLIGHT LEVELING CONTROL UNIT INPUT TEST/REPLACEMENT ).
Individually check the voltage between front and rear suspension stroke sensor 3P connector terminal No. 3 and body ground.

Fig 4: Checking Voltage Between Front And Rear Suspension Stroke Sensor 3P Connector Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Go to step 8.

NO -Check for an open or a short in the wire between the headlight leveling control unit and the front (or rear) suspension stroke sensor. If the wire is OK, replace the front (or rear) suspension stroke sensor (see SUSPENSION STROKE SENSOR REPLACEMENT ).
Reconnect the 3P connector to each suspension stroke sensor.
Remove the nut (A) and the front suspension stroke sensor from the lower sensor arm.

Fig 5: Lower Sensor Arm Nut With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the nut (A) and the rear suspension stroke sensor from the lower arm.

Fig 6: Rear Suspension Stroke Sensor Mounting Nut With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the voltage between headlight leveling control unit 16P connector terminals No. 3 and No. 5 while moving the front suspension stroke sensor arm (A).

Fig 7: Moving Front Suspension Stroke Sensor Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 8: Measuring Voltage Between Headlight Leveling Control Unit 16P Connector Terminals No. 3 And No. 5
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there between 0.5-4.5 V?

YES -Intermittent failure, the system is OK at this time. Check for loose or poor connection between the headlight leveling control unit and the front suspension stroke sensor, if the connections are OK, replace the front suspension stroke sensor (see SUSPENSION STROKE SENSOR REPLACEMENT ).

NO -Check for an open or a short in the wires between the headlight leveling control unit and the front suspension stroke sensor, if the wires are OK, go to step 12.
Measure the voltage between headlight leveling control unit 16P connector terminals No. 2 and No. 5 while moving the rear suspension stroke sensor arm (A).

Fig 9: View Of Moving Rear Suspension Stroke Sensor Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 10: Measuring Voltage Between Headlight Leveling Control Unit 16P Connector Terminals No. 2 And No. 5
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there between 0.5-4.5 V?

YES -Intermittent failure, the system is OK at this time. Check for loose or poor connection between the headlight leveling control unit and the rear suspension stroke sensor, if the connections are OK, replace the rear suspension stroke sensor (see SUSPENSION STROKE SENSOR REPLACEMENT ).

NO -Check for an open or a short in the wire between the headlight leveling control unit and the rear suspension stroke sensor, if the wires are OK, replace the rear suspension stroke sensor (see SUSPENSION STROKE SENSOR REPLACEMENT ).