Opel Frontera UBS. Manual - part 207

 

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Opel Frontera UBS. Manual - part 207

 

 

5A–41

BRAKE CONTROL SYSTEM

The DLC is located behind the center console

350RV010

D

Keep #12 terminal connected with #4 terminal or # 5
terminal (GND) during DTC display. (If #12 terminal
is separated from #4 terminal or # 5 terminal (GND)
during display, display will stop.)

2. DTC display:

D

DTC is displayed by blinking warning light.

D

Double-digit display.

D

First, normal DTC 12 is displayed three times and
then any other DTCs are displayed three times.  (If
no other DTCs have been stored, the display of DTC
12 will be repeated.)

3. How to erase code:

D

Conduct brake switch ON/OFF operation 6 or more
times within 3 seconds of self-diagnosis startup.

D

The code cannot be erased if more than 3 seconds
have passed since self-diagnosis startup, or if
self-diagnosis has started with brake switched on
(brake pedal depressed).

B05RW005

5A–42

BRAKE CONTROL SYSTEM

4. Notes

D

If the following should occurs during Diagnostic
Trouble Code (DTC) display the display will be
discontinued.  After initial check, the status that is
under the control of ABS will be returned :
– The vehicle starts (The wheels turn) or the brake

pedal is depressed. 

D

Up to 3 different codes can be stored. 

D

If the ABS should turn OFF due to an intermittent
defect, the system will be restored at the next key
cycle, if the initial check finds no abnormality (when
IGN is switched from OFF to ON).

5. An example of DTC display

Display of DTC 23

B05RW006

After displaying DTC 12 three times, one DTC after
another is displayed, starting with the most recent
one.  (However, display is discontinued after about 5
minutes.)

B05RS005

The DTC 12 is displayed repeatedly. (display is
discontinued after about 5 minutes)

5A–43

BRAKE CONTROL SYSTEM

Chart B-1 With the key in the ON position (Before starting the engine).  Warning light (W/L)
is not activated.

Step

Action

Yes

No

1

Is W/L fuse C-10 disconnected?

Replace fuse.

Go to Step 5

Go to Step 2

2

Is W/L burnt out?

Replace W/L

bulb.

Go to Step 5

Go to Step 3

3

1. Turn the key off.
2. Disconnect EHCU connector.
3. Turn the key ON.
4. Measure the voltage between EHCU connector terminal 13

and 14.

Is the voltage equal to the battery voltage?

Go to Step 4

Repair harness

and connector.

Go to Step 5

4

Is there continuity between EHCU connector terminals, 12 and 15
and body ground.

Check harness

for suspected

disconnection.

No fault found:

Replace EHCU.

Go to Step 5

Repair harness

and connector.

Go to Step 5

5

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 5

Chart B-2 EHCU Abnormality (DTC 14)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect the EHCU connector.
3. Inspect EHCU ground.

Is there resistance between the EHCU connector terminals, 12
and 15 and body ground?

Go to Step 2

Repair the body

ground harness.

Go to Step 3

2

1. Turn the key off, connect the EHCU.
2. Erase the trouble code.
3. Turn Ignition off, then on, to perform system self-check.
4. If warning light remains on, display trouble codes once again.

Is the check trouble code 14?

Replace EHCU.

Go to Step 3

Inspect in

accordance with

the DTC

displayed.

3

1. Reconnect all components and ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 3

5A–44

BRAKE CONTROL SYSTEM

Chart B-3 Power Voltage Drop (DTC 15)

Step

Action

Yes

No

1

Is the battery voltage normal? (Battery capacity check)

Go to Step 2

Charge or

replace battery.

Go to Step 2

2

1. Turn the key off.
2. Disconnect EHCU connector.
3. Turn the key on.

Is the voltage between EHCU connector terminals 8 and 15,
higher than 10V?

Check harness

connector for

suspected

disconnection.

Fault found:

Repair, and

perform system

self-check.

No fault found:

replace EHCU.

Go to Step 3

Repair harness or

connector.

Go to Step 3

3

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 3

Chart B-4 CLASS-2 Communication Line Abnormality (DTC 16)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU and PCM connector.

Is there continuity between EHCU connector terminals 25 and
ground?

Go to Step 2

Repair harness or

connector.

Go to Step 3

2

1. Connect EHCU connector.
2. Clear diagnostic trouble code.
3. Turn the key on.

Is the diagnostic trouble code 16 shown on the displayed?

Check the PCM

harness. Refer to

6E section.

Go to Step 3

Replace EHCU.

Go to Step 3

3

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 3

 

 

 

 

 

 

 

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