Electric Brake Booster System Symptom Troubleshooting - Brake system indicator (red) and brake system indicator (amber) do not go off
Brake system indicator (red) and brake system indicator (amber) do not go off
1.
DTC check (Electric brake booster):

DTC check (Electric brake booster)
?1.
Turn the vehicle to the ON mode.

?2.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Is DTC indicated?

     
YES
     
     
     
Go to indicated DTC's troubleshooting.?
     
NO
     
     
     
Go to step 2.
2.
Gauge control module operation check:

Gauge control module operation check
?1.
Do the gauge control module self-diagnostic function.

Is the gauge control module OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Fuse check 1:

Fuse check 1
?1.
Turn the vehicle to the OFF (LOCK) mode with driver's door open.

?2.
Wait for 3 minutes.
NOTE: Do not close the driver's door.

?3.
Check the following fuse.
Fuse
No. A1-2 (40 A)
Location
Under-hood fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 4.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair a short to ground in the No. A1-2 (40 A) fuse circuit.?
4.
Fuse check 2:

Fuse check 2
?1.
Check the following fuse.
Fuse
No. D24 (5 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 5.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair a short to ground in the No. D24 (5 A) fuse circuit.?
5.
Fuse check 3:

Fuse check 3
?1.
Check the following fuse.
Fuse
No. D5 (10 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 6.
     
NO
     
     
     
Replace the fuse. Turn the vehicle to the ON mode, then to the OFF (LOCK) mode. If the fuse blows again, repair a short to ground in the No. D5 (10 A) fuse circuit.?
6.
Open wire check (IG1 OPTION line):

Open wire check (IG1 OPTION line)
?1.
Disconnect the following connector.
Electric brake booster 26P connector

?2.
Turn the vehicle to the ON mode.

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Electric brake booster 26P connector: disconnected
Test point 1
Electric brake booster 26P connector No. 24
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The IG1 OPTION wire is OK. Go to step 7.
     
NO
     
     
     
Repair an open in the wire between the under-dash fuse/relay box and the electric brake booster.?
7.
Open wire check (+B EBB line):

Open wire check (+B EBB line):
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Electric brake booster 26P connector: disconnected
Test point 1
Electric brake booster 26P connector No. 2
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The +B EBB wire is OK. Go to step 8.
     
NO
     
     
     
Repair an open in the wire between the under-hood fuse/relay box and the electric brake booster.?
8.
Open wire check (+B OPTION line):

Open wire check (+B OPTION line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Electric brake booster 26P connector: disconnected
Test point 1
Electric brake booster 26P connector No. 4
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The +B OPTION wire is OK. Go to step 9.
     
NO
     
     
     
Repair an open in the wire between the under-dash fuse/relay box and the electric brake booster.?
9.
Open wire check (GND line):

Open wire check (GND line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Electric brake booster 26P connector: disconnected
Test point 1
Electric brake booster 26P connector No. 1
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 10.
     
NO
     
     
     
Repair an open in the wire between the electric brake booster and body ground (G351).?
10.
Open wire check (F-CAN_H, F-CAN_L lines):

Open wire check (F-CAN_H, F-CAN_L lines)
?1.
Disconnect the following connector.
Gauge control module connector A (32P)

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Electric brake booster 26P connector: disconnected
 
Gauge control module connector A (32P): disconnected
Test circuit 1
  
Test point 1
Electric brake booster 26P connector No. 26
Test point 2
Gauge control module connector A (32P) No. 19


Is there continuity?

     
YES
     
     
     
The F-CAN_H and F-CAN_L wires are OK. Check for loose terminals and poor connections in the electric brake booster 26P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric brake booster.?
     
NO
     
     
     
Repair an open in the wire between the electric brake booster and the gauge control module.?