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Topic: HWH Parking Brake sensor (Read 453 times) previous topic - next topic

HWH Parking Brake sensor

When coach is in neutral, parking brake on, ignition off, HWH system in "auto level" mode, the coach does not relevel. There are no LED lights on the control panel at any point and I do not see the "air" light turn on or flash at any point to indicate it's exiting SLEEP mode. Similarly, the coach never re-levels. If I press and hold the "air" button under these conditions, the panel does light up and the "not in park/brake" light flashes at me. Per the 600 series troubleshooting guide (I have a 680 series), I  believe this could be caused by the brake sensor wire and they suggest checking it for ground. Unfortunately, I'm unable to identify that wire on the 680 series control box schematic I have and need help finding it.

Does anyone know where the park brake sensor wire is on a HWH 680 series system? It's apparently a blue wire in the 600 series.

P.S. I have removed the HWH control panel and sprayed the plug with contact cleaner - I don't believe that's the issue.


1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: HWH Parking Brake sensor

Reply #1 –
On our coach with the 600 Series leveling system, my Air System schematic shows a "Parking Indicator Switch" mounted on or close to the "Parking Control Valve" (the yellow knob you pull out to set the parking brake).  If your indicator switch is in the same place, you could check for power and/or ground at the switch.

You could also use a tone generator/wire tracer to trace the ground wire from the switch to the HWH control box.

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"
 

Re: HWH Parking Brake sensor

Reply #2 –
Quote from: Chuck & Jeannie –
On our coach with the 600 Series leveling system, my Air System schematic shows a "Parking Indicator Switch" mounted on or close to the "Parking Control Valve" (the yellow knob you pull out to set the parking brake).  If your indicator switch is in the same place, you could check for power and/or ground at the switch.

You could also use a tone generator/wire tracer to trace the ground wire from the switch to the HWH control box.
Thanks chuck. I found the pressure switch on the back side of the parking brake switch. I removed the plug from the pressure switch and tried jumping the pins to bypass the pressure switch. No luck. So the problem must be after the pressure switch and at or before the control box. The wiring diagram I have shows another plug somewhere inline on wire 9000 (parking brake ground) so I'm going to go hunting for that next.
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.