ECU MERCEDES-BENZ SPRINTER 2006 User Guide

WARNING:REASSEMBLE ALL COMPONENTS
BEFORE ROAD TESTING A VEHICLE. DO NOT
TRY TO READ THE DRBIIITSCREEN OR
OTHER TEST EQUIPMENT DURING A TEST
DRIVE. DO NOT HANG THE DRBIIITOR OTHER
TEST EQUIPMENT FROM THE REARVIEW
MIRROR DURING A TEST DRIVE. HAVE AN
ASSISTANT AVAILABLE TO OPERATE THE
DRBIIITOR OTHER TEST EQUIPMENT.
FAILURE TO FOLLOW THESE INSTRUCTIONS
CAN RESULT IN PERSONAL INJURY OR
DEATH.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt(diagnostic read-out box)
Jumper wires
Ohmmeter
Voltmeter
Test Light
8310 Airbag System Load Tool
8443 SRS Airbag System Load Tool
9001 R F Detector
6.0 GLOSSARY OF TERMS
ABSantilock brake system
ACMairbag control module
ACTactuator
AECMairbag electronic control module
(ACM)
ASDMairbag system diagnostic module
(ACM)
AT Cautomatic temperature control
CABcontroller antilock bake
CANcontroller area network
CHMcabin heater module
CPAconnector positive assurance
CTMcentral timer module
DABdriver airbag
DCHAdiesel cabin heater assist (cabin
heater)
DLCdata link connector
DTCdiagnostic trouble code
DRdriver
EBLelectric back lite (rear window de
fogger)
ECMengine control module
GCCGulf Coast Countries
HBMheater booster module
HVACheater ventilation, air conditioning
ICinstrument cluster
MICmechanical instrument cluster
RSMRain Sensor Module
SAshifter assembly
SKREEMsentry key remote entry module
SSMsecurity system module
TCMtransmission control module
13
GENERAL INFORMATION

Symptom:
*NO RESPONSE FROM CENTRAL TIMER MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE CENTRAL TIMER MODULE
SECURITY SYSTEM MODULE
K-CTM, SSM CIRCUIT SHORTED TO GROUND
SECURITY SYSTEM MODULE
K-CTM, SSM CIRCUIT SHORTED TO VOLTAGE
K-CTM, SSM CIRCUIT OPEN
CENTRAL TIMER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Central Timer Module harness connectors.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!Refer to the wiring diagrams located in the service information to
help isolate an open or shorted condition. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 2
2 Turn the ignition off.
Disconnect the CTM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Go To 4
3 Turn the ignition off.
Disconnect the Security System Module harness connector.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Repair the K-CTM, SSM circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Security System Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
108
COMMUNICATION

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the CTM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-CTM, SSM circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Disconnect the Security System Module harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-CTM, SSM circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Repair the K-CTM, SSM circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Security System Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the CTM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-CTM, SSM circuit between the CTM connector and
the DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Central Timer Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the K-CTM, SSM circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
109
COMMUNICATION
*NO RESPONSE FROM CENTRAL TIMER MODULE ÐContinued

Symptom:
*NO RESPONSE FROM SECURITY SYSTEM MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE SECURITY SYSTEM MODULE
CENTRAL TIMER MODULE
K-CTM, SSM CIRCUIT SHORTED TO GROUND
CENTRAL TIMER MODULE
K-CTM, SSM CIRCUIT SHORTED TO VOLTAGE
K-CTM, SSM CIRCUIT OPEN
SECURITY SYSTEM MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Security System Module harness connectors.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!Refer to the wiring diagrams located in the service information to
help isolate an open or shorted condition. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 2
2 Turn the ignition off.
Disconnect the SSM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Go To 4
3 Turn the ignition off.
Disconnect the Central Timer Module harness connector.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Repair the K-CTM, SSM circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Central Timer Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
120
COMMUNICATION

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the SSM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-CTM, SSM circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Disconnect the Central Timer Module harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-CTM, SSM circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s!Repair the K-CTM, SSM circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Central Timer Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the SSM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-CTM, SSM circuit between the SSM connector and
the DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Security System Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the K-CTM, SSM circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
121
COMMUNICATION
*NO RESPONSE FROM SECURITY SYSTEM MODULE ÐContinued

Symptom:
DRIVER CYLINDER LOCK SWITCH CIRCUIT SHORT TO GROUND
When Monitored and Set Condition:
DRIVER CYLINDER LOCK SWITCH CIRCUIT SHORT TO GROUND
When Monitored: Whenever the battery voltage is above 10.0 volts and the Security
System Module is connected.
Set Condition: If the Driver Cylinder Lock Sense circuit is grounded for over 30 seconds,
this code will set.
POSSIBLE CAUSES
DTC PRESENT
DRIVER CYLINDER LOCK SWITCH SHORTED
DRIVER CYLINDER LOCK SENSE CIRCUIT SHORT TO GROUND
SECURITY SYSTEM MODULE SHORT TO GROUND
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC's.
Cycle the ignition switch from ON to OFF to ON.
With the DRBIIIt, read DTC's.
Remove the ignition key.
Lock and unlock the doors from the Driver Cylinder Lock Switch several times while
observing the DRBIIIt.
Wait 10 seconds.
Does the DRBIIItdisplay DRIVER CYLINDER LOCK SWITCH CIRCUIT SHORT
TO GROUND?All
Ye s!Go To 2
No!The conditions that caused this code to set are not present at this
time. Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors for an intermittent condition.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Driver Cylinder Lock Switch connector.
Measure the resistance between ground and the Driver Cylinder Lock Sense circuit.
Is the resistance below 400.0 ohms?All
No!Replace the Driver Cylinder Lock Switch.
Perform BODY VERIFICATION TEST - VER 1.
Ye s!Go To 3
212
VEHICLE THEFT/SECURITY

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Driver Cylinder Lock Switch connector.
Disconnect the Security System Module.
Measure the resistance between ground and the Driver Cylinder Lock Sense circuit.
Is the resistance below 400.0 ohms?All
Ye s!Repair the Driver Cylinder Lock Sense circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Security System Module.
Perform BODY VERIFICATION TEST - VER 1.
213
VEHICLE THEFT/SECURITY
DRIVER CYLINDER LOCK SWITCH CIRCUIT SHORT TO GROUND Ð
Continued

Symptom:
DRIVER CYLINDER UNLOCK SWITCH CIRCUIT SHORT TO
GROUND
When Monitored and Set Condition:
DRIVER CYLINDER UNLOCK SWITCH CIRCUIT SHORT TO GROUND
When Monitored: Whenever the battery voltage is above 10.0 volts and the Security
System Module is connected.
Set Condition: If the Driver Cylinder Unlock Circuit is closed to ground for over 30
seconds, this code will set.
POSSIBLE CAUSES
DTC PRESENT
DRIVER CYLINDER LOCK SWITCH SHORTED
DRIVER CYLINDER UNLOCK SENSE CIRCUIT SHORT TO GROUND
SECURITY SYSTEM MODULE SHORT TO GROUND
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC's.
Cycle the ignition switch from ON to OFF to ON.
With the DRBIIIt, read DTC's.
Lock and unlock the doors from the Driver Cylinder Lock Switch several times while
observing the DRBIIIt.
Wait 10 seconds.
Does the DRBIIItdisplay DRIVER CYLINDER UNLOCK SWITCH CIRCUIT
SHORT TO GROUND?All
Ye s!Go To 2
No!The conditions that caused this code to set are not present at this
time. Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors for an intermittent condition.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Driver Cylinder Lock Switch connector.
Measure the resistance between ground and the Driver Cylinder Unlock Sense
circuit.
Is the resistance below 400.0 ohms?All
No!Replace the Driver Cylinder Lock Switch.
Perform BODY VERIFICATION TEST - VER 1.
Ye s!Go To 3
214
VEHICLE THEFT/SECURITY

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Driver Cylinder Lock Switch connector.
Disconnect the Security System Module.
Measure the resistance between ground and the Driver Cylinder Unlock Sense
circuit.
Is the resistance below 400.0 ohms?All
Ye s!Repair the Driver Cylinder Unlock Sense circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Security System Module.
Perform BODY VERIFICATION TEST - VER 1.
215
VEHICLE THEFT/SECURITY
DRIVER CYLINDER UNLOCK SWITCH CIRCUIT SHORT TO GROUND Ð
Continued

Symptom:
FRONT DOOR JAMB SWITCH CIRCUIT SHORT TO GROUND
When Monitored and Set Condition:
FRONT DOOR JAMB SWITCH CIRCUIT SHORT TO GROUND
When Monitored: Whenever the battery voltage is above 10.0 volts and the Security
System Module is connected.
Set Condition: If a front door jamb switch is closed or the front courtesy lamps control
circuit is grounded for over 30 minutes, this code will set.
POSSIBLE CAUSES
DTC PRESENT
DRIVER DOOR JAMB SWITCH SHORTED
PASSENGER DOOR JAMB SWITCH SHORTED
SECURITY SYSTEM MODULE SHORTED
FRONT COURTESY LAMPS CONTROL SHORT TO GROUND
TEST ACTION APPLICABILITY
1NOTE: Ensure the front courtesy lamp switches are operating properly
before proceeding.
NOTE: If this code is active, the front courtesy lamps will remain on with all
the doors closed.
With the DRBIIIt, record and erase DTC's.
Cycle the ignition switch from ON to OFF to ON.
With the DRBIIIt, read DTC's.
Open and close the front doors several times while observing the DRBIIIt.
Wait 10 seconds.
Does the DRBIIItdisplay FRONT DOOR JAMB SWITCH CIRCUIT SHORT TO
GROUND?All
Ye s!Go To 2
No!The conditions that caused this code to set are not present at this
time. Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors for an intermittent condition.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Driver Door Jamb Switch connector.
Ensure the passenger door is closed.
Observe the courtesy lamps.
Did the courtesy lamps go off?All
Ye s!Replace the Driver Door Jamb Switch.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
216
VEHICLE THEFT/SECURITY