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Discussion Starter · #1 ·
From a Subaru Video Reference Bulletin:

Sequence Control

With an ABS system, once you have bled
the brakes in the conventional way, you
have to activate Sequence Control to push
air out of the HCU into the brake lines.
Otherwise, air trapped in the HCU will get
into the lines and the customer may return,
complaining that the brakes have become
“spongy.” During Sequence Control, the
HCU turns on the motor-pump assembly
and commands Pressure Decrease, Pressure
Hold, and Pressure Increase for each
caliper.

Using the New Select Monitor, command
Sequence Control, as follows. At the “ABS
Diagnosis” menu, select “4. Function
Check Sequence” and follow the directions
displayed on the New Select Monitor’s
screen. Command Sequence Control
twice, in order to ensure that you have
expelled all air from the HCU. Then bleed
the brakes again, the conventional way, to
remove any air pushed out of the HCU into
the brake lines.

Commanding Sequence Control Without the Select Monitor

You can also command Sequence Control
without the Select Monitor. To do this,
with the ignition switch “Off,” ground terminals
3 and 6 of the diagnosis connector,
using the connector’s grounding wires.

Turn the ignition switch “On” and, within a
half second after the ABS warning light
goes off, depress the brake pedal and hold
it. The ABS will go into Sequence Control
and purge air from the HCU.
 

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I Solve Problems
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18,253 Posts
nice to know.

anyone tried this?
 

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Discussion Starter · #3 ·
i'm going to try it this weekend. :D
 

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16 Posts
kwlsti said:
From a Subaru Video Reference Bulletin:

Sequence Control

With an ABS system, once you have bled
the brakes in the conventional way, you
have to activate Sequence Control to push
air out of the HCU into the brake lines.
Otherwise, air trapped in the HCU will get
into the lines and the customer may return,
complaining that the brakes have become
“spongy.” During Sequence Control, the
HCU turns on the motor-pump assembly
and commands Pressure Decrease, Pressure
Hold, and Pressure Increase for each
caliper.

Using the New Select Monitor, command
Sequence Control, as follows. At the “ABS
Diagnosis” menu, select “4. Function
Check Sequence” and follow the directions
displayed on the New Select Monitor’s
screen. Command Sequence Control
twice, in order to ensure that you have
expelled all air from the HCU. Then bleed
the brakes again, the conventional way, to
remove any air pushed out of the HCU into
the brake lines.

Commanding Sequence Control Without the Select Monitor

You can also command Sequence Control
without the Select Monitor. To do this,
with the ignition switch “Off,” ground terminals
3 and 6 of the diagnosis connector,
using the connector’s grounding wires.

Turn the ignition switch “On” and, within a
half second after the ABS warning light
goes off, depress the brake pedal and hold
it. The ABS will go into Sequence Control
and purge air from the HCU.



This might be a dumb question, I just got my car about a month ago, What is the select monitor? I'm going to put new brake fluid in my car soon....
 

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Discussion Starter · #5 ·
only the dealership has the select monitor...
 

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Would make a nice how-to for us noobs and/or technically challenged (with pics of course).
 

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diagnosis connector= obdII plug?

Wouldn't it be easier to drive the car and slam on the brakes to activate abs? Or does this do something different?
 

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Discussion Starter · #8 ·
did anyone try this, or did you all just go to the dealer ;)
 

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Maybe I'm wrong, but the only reason I can think of for you to actually have to go through this much trouble is if you changed the master cylinder. Otherwise there's very very little chance that there's actually any air trapped that far up in the system.
 

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You should be fine by just activating ABS durin driving and then rebleeding your brakes. However, if you are just doing a brake flush you don't have to do this. Just make sure your master cylinder doesn't get low.

If you are switching lines, you should not have to do this either unless you empty all the fluid while you are doing it. However, this is great information to know.
 

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i wonder if this is the same for WRX's

I'd like more info on the grounding procedure before I start sticking wire up my ECU's butt
 
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