MI91.1270
01SEP15
625 TROUBLE SHOOTING STEPS
AUTOMATIC LEVELING
It is assumed at this point the different components of the leveling system are all functioning properly in the manual
mode. It is also assumed the level sensing unit is properly adjusted with the yellow level indicator lights on the touch
panel off and the vehicle level.
1. With the ignition on (or in ACC.) push the "AUTO LEVEL" button. The AUTO LEVEL light will flash.
2. If the vehicle is equipped with an air suspension, the air will start to dump at this time.
The air will dump for approximately 25 seconds before the leveling sequence starts.
3. The pump will come on and the system will start to extend jacks to level the vehicle.
The system will start by extending jacks to turn a lit side yellow level indicator off first.
4. The appropriate red jack down warning light on the touch panel will come on as the jacks extend 1/4 to 1/2 inch.
If the ignition is in the ON position, the master warning light and buzzer will come on.
5. The system will extend jacks as necessary until the yellow level lights are all off. When all of the level lights
are off, there will be a short (2 seconds) pause before the system goes into the stabilize mode. Once in the
stabilization mode, yellow level lights will not come back on.
6. STABILIZE MODE: Stabilize mode is when any jack not used to level the vehicle is extended to the ground.
Jacks that are used to stabilize the vehicle should lift the vehicle between 1/4 and 3/4 inch after the jack touches
the ground. Each jack has a pressure switch mounted on it. The pressure switch is a normally open, one
wire switch. The switch closes when the jack touches the ground and lifts the vehicle 1/4 to 3/4 inch.
NOTE: If either pressure switch for the front jacks is not on, both front solenoid valves
will remain on until both front pressure switches are on.
7. When the system has completed the stabilize mode, the system will shut off. The red warning lights will remain
This sends a ground signal to the control box. The control box will then shut off the solenoid valve for that jack.
DIAGNOSTICS
PART 2. IF ANY PROBLEMS OCCUR DURING STEPS 2 THROUGH 6 REVIEW THE DIAGNOSTICS
1. If jacks that are stabilizing extend but don’t quite reach the ground or don’t lift enough,
a. If the red LED is not on, retry that jack manually. If the jack will extend manually but not
IN THE MANUAL OPERATION DIAGNOSTIC SECTION OF THIS MANUAL.
the pressure switch may need adjusted. Remove the rubber boot, loosen the jam nut
and turn the threaded portion clockwise 1/4 turn and retry. Repeat this as necessary.
If adjusting the switch does not work, replace the switch.
TO THE GROUND AND LIFT THE VEHICLE 1/4 TO 3/4 INCH.
PART 3. DURING THE STABILIZE MODE ONE OR MORE JACKS WILL NOT EXTEND
2. If a jack does not extend at all, check the red LED
in stabilize and the red LED is not on, replace the control box. If the jack will not extend
manually, review PART 11 of the MANUAL OPERATION diagnostic section of this manual.
b. If the red LED is on, the jack pressure switch is stuck on, the wire in the harness
is shorted to ground or the control box is bad. Unplug the pressure switch and
check the LED. If the red LED goes out, replace the pressure switch. If the red
LED is still on, unplug the 12 pin gray connector from the control box. If the red
LED goes out, the wire in the harness is shorted to ground. If the red LED stays
on, replace the control box. The pressure switch LEDs and wires are as follows:
LEFT FRONT PRESSURE SWITCH ----- LED 25 ----- WIRE 1200 ----- PIN 5
RIGHT FRONT PRESSURE SWITCH --- LED 26 ----- WIRE 2200 ----- PIN 6
RIGHT REAR PRESSURE SWITCH ----- LED 27 ----- WIRE 3200 ----- PIN 7
LEFT REAR PRESSURE SWITCH ------- LED 28 ----- WIRE 4200 ----- PIN 8
SEE: MP85.184J
SEE: MP85.091C
NOTE: Due to the "bumping" of the vehicle during the stabilize modes a
yellow level light may come on after the AUTO LEVEL light turns off.
LIGHT WILL NOT FLASH WHEN THE AUTO LEVEL BUTTON IS PUSHED. NOTHING ELSE HAPPENS.
PART 1. THE IGNITION IS IN THE "ACC" OR "ON" POSITION. THE PARK BRAKE IS SET. THE AUTO LEVEL
or control box. Remember to check voltage. Low voltage can cause erratic operation.
1. Recheck the manual buttons. If they function correctly, the problem is the touch panel
50 LB PRESS SW INPUT
33-GREEN
LEFT SIDE
LATER LED’S 3 AND 19 WILL TURN OFF.
IS PUSHED, LED’s 7 AND 20 WILL TURN OFF. 5 SECONDS
PUSHED. TWO SECONDS AFTER THE "STORE" BUTTON
TOUCH PANEL IS ON UNLESS THE "STORE" BUTTON IS
LED’S 19 AND 20 (YELLOW) WILL BE ON WHENEVER THE
IT IS ONLY USED WITH PILOT OPERATED AIR DUMP
VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS.
NOTE: THE TRAVEL RELAY IS NOT USED ON
TRAVEL MODE AND THE IGNITION IS ON.
WILL BE ON IF THE LEVELING SYSTEM IS IN THE
NOTE: THE TRAVEL RELAY IS WIRED AS A
NORMALLY CLOSED RELAY. WHEN THE YELLOW
LED (17) IS ON THE RELAY CONTACTS WILL OPEN.
THE RED LED (18) WILL NOT BE ON. THE RED LED
MP85.184J
PROBLEM WITH THE CONTROL BOX, TOUCH PANEL
NOTE: A LIT YELLOW LED INDICATES THERE
IS A GROUND SIGNAL TO TURN THE
A LIT RED LED INDICATES THERE IS
VOLTAGE ON IT’S CORRESPONDING OUTPUT PIN.
CORRESPONDING RED LED IS OFF, EITHER
IT’S FUSE IS BLOWN OR THE RELAY IS BAD.
IF THE YELLOW LED’S ARE WORKING BUT
NO RED LED IS COMING ON THERE MAY BE
PROBLEM WITH INPUT VOLTAGE IN THE
IF A YELLOW LED IS NOT LIT, THERE IS A
ELECTRICAL CONNECTION DIAGRAM - CONTROL
INFORMATION ABOUT PIN CONNECTIONS SEE
NOTE: FOR DETAILED INPUT / OUTPUT
OR CONNECTION CABLE
4-PIN CONNECTOR.
CORRESPONDING RELAY ON.
BOX CONNECTION INFORMATION.
IF A YELLOW LED IS LIT AND THE
GROUND
39
SYSTEMS.
38
36
37
34-RED
38-RED
39-RED
37-RED
36-RED
35-RED
13AUG07
MP85.184J
F10 - 10 AMP
MASTER WARNING
ACCESSORY OUT FOR
JACK INTERRUPT
LINK LIGHT
ACCESSORY IN
BOARD ENABLE
PARK BRAKE
PF4
CONTROL BOX - LED - FUSE LOCATION AND DESCRIPTION
625 SERIES LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
31
LEFT
PUMP
RELAY
RELAY
MASTER
TRAVEL
DUMP
SENSING UNIT
+12V
REAR
FRONT
RIGHT SIDE
PIN 1
23
25
24
28
26
27
21
22
30
29
RIGHT
FUSE
LED
1
2
3
F1
4
12
11
F2
REAR
REAR
LEFT
RIGHT
FRONT
CRX2
FRONT
F7
F6
14
13
19
7
5
15
16
6
F8
17
F3
18
8
14-RED
F10
32
35
34
33
24-YELLOW
31-GREEN
30-YELLOW
32-RED
29-RED
28-RED
27-RED
26-RED
25-RED
PF4
15-YELLOW
23-YELLOW
22-YELLOW
21-YELLOW
20-YELLOW
19-YELLOW
17-YELLOW
18-RED
16-RED
PF3
CRX1
F4
F9
20
2-RED
3-YELLOW
13-YELLOW
11-YELLOW
7-YELLOW
5-YELLOW
12-RED
8-RED
6-RED
4-RED
1-YELLOW
LED
F9 - 5 AMP
F8 - 5 AMP
F7 - 5 AMP
F6 - 5 AMP
F4 - 15 AMP
F3 - 15 AMP
F2 - 15 AMP
F1 - 15 AMP
FUSE
MASTER RELAY OUTPUT
LEFT REAR WARN SW
RIGHT REAR WARN SW
RIGHT FRONT WARN SW
LEFT FRONT WARN SW
RIGHT REAR PRESS SW
MASTER WARN CONTROL
3000 LB PRESS SW INPUT
LEFT REAR PRESS SW
RIGHT FRONT PRESS SW
LEFT FRONT PRESS SW
NOT USED
NOT USED
PUMP COIL
TRAVEL OUTPUT
TRAVEL COIL
PUMP OUTPUT
CRX 2
CRX 1
RIGHT REAR OUTPUT
RIGHT REAR COIL
RELAY DESCRIPTION
MASTER RELAY COIL
LEFT FRONT OUTPUT
LEFT FRONT COIL
RIGHT FRONT OUTPUT
RIGHT FRONT COIL
LEFT REAR OUTPUT
LEFT REAR COIL
DUMP OUTPUT
DUMP COIL
in the control box for that pressure switch.
STUD
MP85.091C
PILOT AIR DUMP
SWITCH
WARNING
4000
4200
9300
LEFT REAR
9301
6230
6231
SWITCH
PRESSURE
B
A
6235
CONNECTION
B
A
C
6230
9301
9300
6231
08AUG07
MP85.091C
RIGHT REAR
6235
3200
SWITCH
PRESSURE
WARNING
SWITCH
3000
B
A
PILOT AIR DUMP - PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
625 SERIES SINGLE STEP LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
GROUND
TO HWH
BUZZER
6111
PRESSURE
SWITCH
WARNING
PARK BRAKE
6111
SWITCH
7699
DIODE
DIODE
7699
7699
+
LIGHT
MASTER
WARNING
LEFT FRONT
1200
6110
FUSE
5AMP
1000
SWITCH
B
A
6235
PARK BRAKE
9001 - TO
9000
LIGHT
_
7699
9000
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
CAUTION!
TOUCH PANEL
HWH COMPUTERIZED LEVELING
EXCESS
SLOPE
BRAKE
TRAVEL
TO ACCESSORY
TO IGNITION
6120
R
PARK/
MODE
STOP
EMERGENCY
AUTO
STORE
LEVEL
AUTO
NOT IN
EXTEND
RETRACT
EXTEND
RETRACT
MANUAL
CONNECTION
PILOT DUMP
RIGHT FRONT
LEVELING SYSTEM - LEVELING
MASTER RELAYS
MANIFOLD - PUMP AND
DIAGRAM - 625 SERIES
4 PIN
GRAY
12 PIN
BLACK
12 PIN
8 PIN
BLACK
GREEN
12 PIN
BROWN
GRAY
12 PIN
SEE ELECTRICAL CONNECTION
6235
SWITCH
PRESSURE
6230 - 6231
9300
9301
SWITCH
WARNING
2000
2200
BY OEM
B
A
on until the ignition is turned off. If the ignition is in the ON position, not ACC position, the master warning light
and buzzer will be on until the ignition is turned off.
