MI91.1215
14AUG07
625 TROUBLE SHOOTING STEPS
MANUAL OPERATION
air dump valves or one or more of the air dump valves may be bad.
PART 7. If F6 is blown, there may be a short on the 9300 wire going to the HWH
wires or their connection to the master relay. If the pump does not run, proceed to
replace the control box. If power is not present, there is a problem with these
wires in the four pin connector on the back of the control box. If power is present,
any manual UP arrow button. If the pump runs, check for power on the two black
box. If LED 11 is on but LED 12 is off, check fuse F6. If F6 is not blown, push
should be off. If LEDs 11and/or 17 are not on, or LED 18 is on, replace the control
11 and 17 (YELLOW) along with LED 12 (RED) should be on. LED 18 (RED)
dump valve(s). Check that the exhaust ports for the air dump valves are not plugged.
wire or their pin connections. If power is present at the connectors, replace the air
air dump valves. If there is no power, the problem is the 9300 wire, the white ground
between the 9300 (BLACK) wire and the white wire in the Packard connector at the
9300 wire. If there is power on the 9300 wire at the control box, check for power
control box. If not, there is a problem with the connector, pin connections or the
be power on the 9300 wire on pin 11 in the 12 pin brown connector on the back of
valve for each height control valve on the suspension. Air will only be exhausted while
PANEL IS PUSHED. THE IGNITION IS ON AND THE PARK BRAKE IS SET.
FROM THE SUSPENSION AIR BAGS WHEN THE "DUMP" BUTTON ON THE TOUCH
the "DUMP" button is being pushed.
b. LEDs 11 and 17 (YELLOW) and LED 12 (RED) are on. LED 18 is off. There should
a. Check LEDs 11, 12, 17 and 18 while the "DUMP" button is being pushed. LEDs
PART 3. FOR VEHICLES EQUIPPED WITH AN AIR SUSPENSION. THE AIR WILL NOT EXHAUST
2. For vehicles equipped with the HWH air dump valves. There is normally one air dump
1. The "NOT IN PARK/BRAKE" light on the touch panel
comes on while the "DUMP" button is being pushed.
a. Check that the park brake is set.
b. Check LED 35 on the board in the control box. SEE: MP85.185J
SEE: MP85.185J & MP85.186E
SEE: MP85.184J & MP85.091C
If LED 35 is off, check for a ground on the 9000 wire on pin 7 of the 12 pin black
connector on the back of the control box. If there is a ground on wire 9000, unplug
the 12 pin black connector and ground pin 7 in the box receptacle. If LED 35 does not
come on, replace the control box. If LED 35 does come on the problem is wire 9000
or the 12 pin black connection. If there is no ground on wire 9000, the problem is
wire 9000 or the park brake switch.
3. For vehicles equipped with a pilot air dump system supplied by the chassis manufacturer
a. Check LEDs 11, 12, 17 and 18 while the "DUMP" button is being pushed. LEDs 11
and controlled electronically by the HWH leveling system. The "DUMP" button may be
pushed and released. The pilot valve should shift to the dump position and remain there.
and 17 (YELLOW) along with LED 12 (RED) should be on. LED 18 (RED) should be
off. If LEDs 11and/or 17 are not on, or LED 18 is on, replace the control box. If LED
11 is on but LED 12 is off, check fuse F6. If F6 is not blown, push any manual UP
arrow button. If the pump runs, check for power on the two black wires in the four pin
connector on the back of the control box. If power is present, replace the control box.
If power is not present, there is a problem with these wires or their connection to the
master relay. If the pump does not run, proceed to PART 7. If F6 is blown, there may
be a short on the 9300 wire or a problem with the suspension pilot dump valve.
Locate the 4 pin UML connector in the HWH harness. Unplug the 4 pin connector.
Replace the F6 fuse and retry. If the fuse blows again, the problem is with the HWH
9300 wire. If the fuse does not blow, the problem is with the pilot dump valve.
Contact the vehicle manufacturer for assistance. SEE: MP85.184J & MP85.091C
MP85.186E
IGN OUT
(SHIELD)
LD38
MP85.185J
LD39
R
LD37
LD36
R
R
R
12
CN6
GND
CR5
CR6
1
PF1
CN9
T2
R
LD28
CN1
LD23
LD25
LD24
LD22
LD21
LD27
LD26
Y
R
Y
Y
Y
LD29
R
R
R
LD33
G
LD31
LD30
Y G
LD32
R
LD35
LD34
R R
GND
CR7
CR8
CR9
GND
08AUG07
MP85.185J
8
F10
IGN CL CH
PF3
CN8
PF4
CN7
12
1
1
AUX
CN3
12
1
CIRCUIT BOARD CONNECTOR AND PIN LOCATIONS
ELECTRICAL CONNECTION DIAGRAM
CR10
CR1
CR2
CR3
CR4
CR11
+12
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
SYSTEMS.
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
CONTROL BOX - LED - FUSE LOCATION AND DESCRIPTION
625 SERIES LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
OR CONNECTION CABLE
PROBLEM WITH THE CONTROL BOX, TOUCH PANEL
NOTE: A LIT YELLOW LED INDICATES THERE
IS A GROUND SIGNAL TO TURN THE
CORRESPONDING RELAY ON.
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
4-PIN CONNECTOR.
IF A YELLOW LED IS NOT LIT, THERE IS A
IF A YELLOW LED IS LIT AND THE
BOX CONNECTION INFORMATION.
ELECTRICAL CONNECTION DIAGRAM - CONTROL
INFORMATION ABOUT PIN CONNECTIONS SEE
NOTE: FOR DETAILED INPUT / OUTPUT
+12V
REAR
FRONT
GROUND
RIGHT SIDE
LEFT SIDE
28
39
36
37
38
SENSING UNIT
3
1
PIN 1
FUSE
LED
2
DUMP
4
F1
12
11
F2
REAR
RIGHT
REAR
LEFT
7
5
32
F4
F9
21
26
27
25
24
23
22
31
30
29
15
16
F7
MASTER
RELAY
RELAY
F6
14
13
19
6
F8
PUMP
TRAVEL
17
F3
18
8
35
34
33
PF3
F10
PF4
20
RIGHT
CRX2
FRONT
FRONT
LEFT
CRX1
RIGHT REAR PRESS SW
MASTER WARNING
LINK LIGHT
ACCESSORY OUT FOR
ACCESSORY IN
BOARD ENABLE
PARK BRAKE
JACK INTERRUPT
50 LB PRESS SW INPUT
MASTER WARN CONTROL
3000 LB PRESS SW INPUT
NOT USED
NOT USED
LEFT REAR PRESS SW
38-RED
39-RED
33-GREEN
31-GREEN
30-YELLOW
37-RED
36-RED
35-RED
34-RED
32-RED
29-RED
28-RED
13AUG07
MP85.184J
PF4
F10 - 10 AMP
RIGHT FRONT PRESS SW
LEFT FRONT PRESS SW
LEFT REAR WARN SW
RIGHT REAR WARN SW
RIGHT FRONT WARN SW
LEFT FRONT WARN SW
CRX 2
TRAVEL OUTPUT
TRAVEL COIL
PUMP OUTPUT
PUMP COIL
MASTER RELAY OUTPUT
MASTER RELAY COIL
DUMP OUTPUT
DUMP COIL
LEFT FRONT OUTPUT
LEFT FRONT COIL
RIGHT FRONT OUTPUT
RIGHT FRONT COIL
LEFT REAR OUTPUT
24-YELLOW
23-YELLOW
22-YELLOW
21-YELLOW
20-YELLOW
19-YELLOW
17-YELLOW
27-RED
26-RED
25-RED
18-RED
CRX 1
15-YELLOW
13-YELLOW
11-YELLOW
7-YELLOW
5-YELLOW
16-RED
14-RED
12-RED
8-RED
6-RED
4-RED
LEFT REAR COIL
RIGHT REAR OUTPUT
RIGHT REAR COIL
RELAY DESCRIPTION
3-YELLOW
1-YELLOW
2-RED
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
MP85.184J
MP85.091C
PILOT AIR DUMP
STUD
TO HWH
GROUND
SWITCH
WARNING
LEFT REAR
4200
SWITCH
4000
PRESSURE
A
B
6235
6231
9301
9300
6230
SWITCH
CONNECTION
DIODE
6231
A
B
C
9301
9300
6230
9001 - TO
PARK BRAKE
LIGHT
9000
7699
08AUG07
RIGHT REAR
MP85.091C
SWITCH
6235
PRESSURE
SWITCH
WARNING
3000
3200
A
B
GRAY
4 PIN
12 PIN
BLACK
BLACK
8 PIN
GREEN
12 PIN
12 PIN
GRAY
ELECTRICAL CONNECTION DIAGRAM
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PILOT AIR DUMP - PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
625 SERIES SINGLE STEP LEVELING SYSTEM
PRESSURE
WARNING
SWITCH
6111
BUZZER
PARK BRAKE
6111
DIODE
7699
MASTER
WARNING
LIGHT
7699
7699
6110
5AMP
FUSE
+
LEFT FRONT
1000
SWITCH
1200
A
B
6235
9000
TO IGNITION
TO ACCESSORY
_
6120
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
CAUTION!
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
EXCESS
TRAVEL
HWH COMPUTERIZED LEVELING
TOUCH PANEL
NOT IN
PARK/
SLOPE
AUTO
LEVEL
STOP
EMERGENCY
MODE
STORE
AUTO
BRAKE
R
EXTEND
RETRACT
MANUAL
EXTEND
RETRACT
RIGHT FRONT
PILOT DUMP
CONNECTION
9300
DIAGRAM - 625 SERIES
MANIFOLD - PUMP AND
MASTER RELAYS
SEE ELECTRICAL CONNECTION
LEVELING SYSTEM - LEVELING
6230 - 6231
9301
BROWN
12 PIN
BY OEM
6235
PRESSURE
SWITCH
WARNING
SWITCH
2000
2200
A
B
SEE: MP85.184J & MP85.091C
LEFT FRONT PRESS SW
PF4
25-RED
SENSING UNIT
LATER LED’S 3 AND 19 WILL TURN OFF.
NOTE: THE TRAVEL RELAY IS WIRED AS A
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
WILL BE ON IF THE LEVELING SYSTEM IS IN THE
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
NOTE: THE TRAVEL RELAY IS NOT USED ON
IT IS ONLY USED WITH PILOT OPERATED AIR DUMP
VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS.
TRAVEL MODE AND THE IGNITION IS ON.
MP85.184J
ELECTRICAL CONNECTION DIAGRAM - CONTROL
CORRESPONDING RED LED IS OFF, EITHER
IT’S FUSE IS BLOWN OR THE RELAY IS BAD.
IF THE YELLOW LED’S ARE WORKING BUT
PROBLEM WITH INPUT VOLTAGE IN THE
IF A YELLOW LED IS NOT LIT, THERE IS A
NO RED LED IS COMING ON THERE MAY BE
NOTE: A LIT YELLOW LED INDICATES THERE
IS A GROUND SIGNAL TO TURN THE
A LIT RED LED INDICATES THERE IS
PROBLEM WITH THE CONTROL BOX, TOUCH PANEL
VOLTAGE ON IT’S CORRESPONDING OUTPUT PIN.
INFORMATION ABOUT PIN CONNECTIONS SEE
NOTE: FOR DETAILED INPUT / OUTPUT
4-PIN CONNECTOR.
OR CONNECTION CABLE
IF A YELLOW LED IS LIT AND THE
BOX CONNECTION INFORMATION.
CORRESPONDING RELAY ON.
FRONT
PIN 1
RIGHT SIDE
+12V
REAR
GROUND
LEFT SIDE
26
28
27
39
SYSTEMS.
38
37
36
35-RED
39-RED
36-RED
38-RED
37-RED
31-GREEN
30-YELLOW
32-RED
29-RED
28-RED
27-RED
26-RED
34-RED
33-GREEN
13AUG07
MP85.184J
F10 - 10 AMP
MASTER WARNING
RIGHT REAR PRESS SW
LEFT REAR PRESS SW
RIGHT FRONT PRESS SW
3000 LB PRESS SW INPUT
ACCESSORY OUT FOR
50 LB PRESS SW INPUT
MASTER WARN CONTROL
JACK INTERRUPT
PARK BRAKE
LINK LIGHT
BOARD ENABLE
ACCESSORY IN
NOT USED
NOT USED
PF4
625 SERIES LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
CONTROL BOX - LED - FUSE LOCATION AND DESCRIPTION
31
LEFT
LED
FUSE
F1
2
F2
12
11
4
DUMP
MASTER
TRAVEL
22
21
25
24
23
30
29
RELAY
14
13
F6
19
F7
RELAY
17
16
15
6
18
F8
8
F3
PUMP
1
REAR
RIGHT
LEFT
3
REAR
CRX2
FRONT
5
7
RIGHT
FRONT
4-RED
34
33
32
35
F10
F9
20
F4
23-YELLOW
22-YELLOW
21-YELLOW
20-YELLOW
19-YELLOW
17-YELLOW
18-RED
16-RED
24-YELLOW
PF3
7-YELLOW
11-YELLOW
5-YELLOW
13-YELLOW
12-RED
8-RED
6-RED
15-YELLOW
14-RED
CRX1
1-YELLOW
3-YELLOW
2-RED
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
LEFT REAR OUTPUT
RIGHT REAR WARN SW
RIGHT FRONT WARN SW
LEFT FRONT WARN SW
MASTER RELAY OUTPUT
MASTER RELAY COIL
LEFT FRONT OUTPUT
RIGHT FRONT OUTPUT
LEFT FRONT COIL
RIGHT FRONT COIL
LEFT REAR WARN SW
PUMP OUTPUT
TRAVEL OUTPUT
TRAVEL COIL
CRX 2
CRX 1
DUMP OUTPUT
DUMP COIL
PUMP COIL
RELAY DESCRIPTION
RIGHT REAR COIL
RIGHT REAR OUTPUT
LEFT REAR COIL
12 PIN
BROWN
SWITCHED GROUND FROM LEFT REAR PRESSURE SWITCH
NO CONNECTION
NO CONNECTION
BUZZER & MASTER WARNING LIGHT CONTROL - SWITCHED GROUND
NO CONNECTION
SWITCHED GROUND FROM PARK BRAKE SWITCH
NO CONNECTION
+12 BATTERY FROM MASTER RELAY
GROUND FROM HWH GROUND STUD
SW12V BATTERY POWER FROM MASTER RELAY
SW12V BATTERY POWER FROM MASTER RELAY
NO CONNECTION
SWITCHED BATTERY
+12 ACCESSORY / IGNITION
PUMP RELAY CONTROL - SW12
SW12 FOR DUMP
SW12 FOR RIGHT FRONT SOLENOID VALVE
SW12 FOR RIGHT REAR SOLENOID VALVE
SW12 FOR LEFT REAR SOLENOID VALVE
GROUND FOR RIGHT REAR SOLENOID VALVE
GROUND FOR RIGHT FRONT SOLENOID VALVE
SW12 FOR LEFT FRONT SOLENOID VALVE
SW12 FOR TRAVEL
50 LB PRESSURE SWITCH - SWITCHED GROUND
3000 LB PRESSURE SWITCH - SWITCHED GROUND
MASTER RELAY CONTROL - SW12
SHARED GROUND FOR WARNING SWITCHES
625 SERIES LEVELING SYSTEM
SWITCHED GROUND FROM RIGHT REAR WARNING SWITCH
NO CONNECTION
SWITCHED GROUND FROM LEFT REAR WARNING SWITCH
SWITCHED GROUND FROM RIGHT REAR PRESSURE SWITCH
SWITCHED GROUND FROM RIGHT FRONT PRESSURE SWITCH
SWITCHED GROUND FROM LEFT FRONT PRESSURE SWITCH
SWITCHED GROUND FROM LEFT FRONT WARNING SWITCH
SWITCHED GROUND FROM RIGHT FRONT WARNING SWITCH
CONTROL BOX CONNECTION INFORMATION
ELECTRICAL CONNECTION DIAGRAM
BLACK
6
7600
BLACK
BLACK
YELLOW
BLACK
BLACK
12 PIN BLACK CONNECTOR
8 PIN BLACK CONNECTOR
WHITE
GREEN
BLACK
BLACK
BLACK
BLACK
BLACK
WHITE
BLACK
BLACK
BLACK
BLACK
BLACK
12 PIN GRAY CONNECTOR
BLACK
BLACK
1 AND 2
MP85.6031
12
11
10
9
8
7
6
5
3
4
11
1 AND 2
8
6
7
5
12
3
4
RED
RED
8 THRU 10
1 THRU 6
7
12
10
11
8
7
9
4200
6235
4000
3000
3200
2200
1200
1000
2000
7699
6120
6800
6230
9000
8600
9300
4400
2400
3400
7601
CAN HIGH
GROUND
CAN SHIELD
CAN LOW
BLACK
BLACK
BLACK
BLACK
WHITE
4 PIN GRAY CONNECTOR
12 PIN BROWN CONNECTOR
BLACK
BLACK
BLACK
WIRE
COLOR
5
3
2
4
1
4
3
2
1
RED
PIN #
PIN 1
PIN 12
NUMBER
9301
8500
1400
8101
8100
6800
6230
6100
6800
PIN 1
PIN 8
WIRE
PIN 4
PIN 1
4 PIN
GRAY
MP85.186E
13AUG07
12 PIN
WIRE DESCRIPTION AND FUNCTION
PIN 12
BLACK
BLACK
8 PIN
12 PIN
GRAY
PIN 1
PIN 12
PIN 1
