How to Troubleshoot the Electric Brake Booster System
System Indicator
This system has two indicators on the gauge control module.

NOTE: For locations of each indicator, refer to gauge control module component location index.

When the system is OK, each indicator comes on for about 2 seconds after turning the vehicle to the ON mode, then it goes off.

When the system detects a problem, a DTC will set and depending upon the failure, the electric brake booster determines which indicator(s) will turn on. If the problem goes away (system returns to normal), the indicator(s) will be controlled in the following way depending upon the DTC that was set:
The indicator(s) will come on and stay on when turning the vehicle to the ON mode.
The indicator(s) will automatically go off.
The indicator(s) will go off after the vehicle is driven.
Brake System Indicator (Red)
The brake system indicator (red) comes on when the electric brake booster servo control is lost, the EBD function is lost, the parking brake is applied, and/or the brake fluid level is low.

NOTE: If two or more wheel speed sensors fail, the brake system indicator (red) will come on along with the VSA indicator.
Brake System Indicator (Amber)
The brake system indicator (amber) comes on, when the brake control system is lost.
Diagnostic Trouble Code (DTC)
The memory can hold 10 DTCs. However, when the same DTC is detected more than once, the more recent DTC is written over the earlier one. Therefore, when the same problem is detected repeatedly, it is memorized as a single DTC.
The DTCs are indicated in ascending order, not in the order they occurred.
The DTCs are memorized in an EEPROM in the electric brake booster. Therefore, the memorized DTCs cannot be erased by disconnecting the 12 volt battery. Do the specified procedures to clear the DTCs.
Self-Diagnosis
Self-diagnosis can be classified into two categories:
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Initial diagnosis: Done right after the vehicle turned to the ON mode and until the brake system indicator (red) and the brake system indicator (amber) go off.
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Regular diagnosis: Done right after the initial diagnosis until turning the vehicle to the OFF (LOCK) mode.
When the system detects a problem, the electric brake booster shifts to fail-safe mode.
Hydraulic Boost Failure Compensation
This vehicle is equipped with a hydraulic boost failure compensation. This hydraulic boost failure compensation uses the VSA modulator-control unit's pressurization control to provide additional brake assist. This is necessary when the electric brake booster system is lost. The hydraulic boost failure compensation can be heard when operating and some kickback will be felt on the brake pedal. The hydraulic boost failure compensation may also be activated in some high altitude conditions. These are considered normal characteristics of this system.
How to Troubleshoot DTCs
The troubleshooting procedures assume that the cause of the problem is still present and the brake system indicator (red), and/or brake system indicator (amber) are still on. Following a troubleshooting procedure for a DTC that has been cleared but does not reset can result in incorrect diagnosis.

1.
Question the customer about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the brake system indicator (red), and/or brake system indicator (amber) came on, such as during activation, after activation, when the vehicle was traveling at a certain speed, etc. If necessary, have the customer demonstrate the concern.

2.
When the brake system indicator (red) or brake system indicator (amber) does not come on during the test-drive, but troubleshooting is done based on the DTC, check for loose connectors, poor contact of the terminals, etc. in the circuit indicated by the DTC.

3.
After troubleshooting, or the repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions that originally set the DTCs. Make sure the brake system indicator (red) and brake system indicator (amber) do not come on.
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 Use the HDS (Honda Diagnostic System)
NOTE: Make sure the 12 volt battery is in good condition and fully charged.

1.
If the system indicator(s) stay on, connect the HDS to the data link connector (DLC).

2.
Turn the vehicle to the ON mode.

3.
Make sure the HDS communicates with the vehicle and the electric brake booster. If it does not, go to the F-CAN circuit troubleshooting.

4.
Check the diagnostic trouble code (DTC) and the freeze data, for all systems, troubleshoot the powertrain DTCs first. Then refer to the indicated DTC's troubleshooting, and do the appropriate troubleshooting procedure.
NOTE:
Freeze data indicates the electric servo brake system 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.
For specific operations, refer to the HDS Help menu.
How to Retrieve DTCs
1.
With the vehicle in OFF (LOCK) mode, connect the HDS to the data link connector (DLC).

2.
Turn the vehicle to the ON mode.

3.
Make sure the HDS communicates with the vehicle and the electric brake booster. If it does not, go to the F-CAN circuit troubleshooting.

4.
Follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, refer to the DTC troubleshooting. Do the all systems DTC check, and troubleshoot any powertrain DTCs first.

5.
Turn the vehicle to the OFF (LOCK) mode.
How to Clear DTCs
1.
With the vehicle in OFF (LOCK) mode, connect the HDS to the data link connector (DLC).

2.
Turn the vehicle to the ON mode.

3.
Make sure the HDS communicates with the vehicle and the electric brake booster. If it does not, go to the F-CAN circuit troubleshooting.

4.
Clear the DTC(s) by following the screen prompts on the HDS.

5.
Turn the vehicle to the OFF (LOCK) mode.