Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 82
Symptom:
CAB OPTION
When Monitored and Set Condition:
CAB OPTION
When Monitored:
Ignition On - Once
Set Condition:
When the vehicle line information transmitted does not match the
expected values.
POSSIBLE CAUSES
INTERMITTENT CAB OPTION DTC
DAMAGED CAB/CAB HARNESS CONNECTOR
FUSED OPTIONAL EQUIPMENT RELAY OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
ANTI-LOCK BRAKE CONTROLLER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
With the DRBIII
t, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display CAB OPTION?
All
Yes
→ Go To 2
No
→ Go To 6
2
Turn the ignition off.
Disconnect the CAB harness connector.
Inspect the CAB/CAB harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
23
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Optional Equipment
Relay Output circuit at the CAB harness connector.
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
Yes
→ Go To 4
No
→ Repair the Fused Optional Equipment Relay Output circuit for an
open.
Perform ABS VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to ground, check both Fused B(+) circuits at the
CAB harness connector.
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
Yes
→ Go To 5
No
→ Repair the Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, check the CAB harness connector
Ground circuits.
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
Yes
→ Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Visually inspect the related wiring harness.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out, or corroded terminals.
Were any problems found?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Test Complete.
24
BRAKES (CAB)
CAB OPTION —
Continued
Symptom:
CAN COMMUNICATION ERROR
POSSIBLE CAUSES
CAN DTCS PRESENT IN OTHER MODULES
INTERMITTENT CAN COMMUNICATION ERROR DTC
DAMAGED CAB/CAB HARNESS CONNECTOR
CAN CIRCUIT(S) SHORT TO VOLTAGE
CAN CIRCUIT(S) SHORTED TOGETHER
CAN CIRCUIT(S) SHORT TO GROUND
CAN CIRCUIT(S) OPEN
FUSED OPTIONAL EQUIPMENT RELAY OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
ANTI-LOCK BRAKE CONTROLLER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Diagnose any Steering Angle Sensor DTCs that are present in this
module before continuing.
With the DRBIII
t, read DTCs in the Engine Control Module, Transmission Control
Module, and Instrument Cluster.
Are there any CAN communication DTCs present in any of these modules?
All
Yes
→ Refer to the diagnostic procedures for any CAN DTCs in ECM,
TCM and Cluster before proceeding with this test.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 2
2
NOTE: If a system undervoltage or overvoltage DTC is set along with this
DTC, diagnose the system voltage DTC first.
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Turn the ignition off.
Start the engine.
With the DRBIII
t, read DTCs.
Does this DTC reset?
All
Yes
→ Go To 3
No
→ Go To 11
3
Turn the ignition off.
Disconnect the CAB harness connector.
Inspect the CAB/CAB harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 4
25
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of the CAN(+) circuit.
Measure the voltage of the CAN(-) circuit.
Is the voltage above 3.0 volts for either circuit?
All
Yes
→ Repair the CAN circuit(s) for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between ground and the CAN(+) circuit.
Measure the resistance between ground and the CAN(-) circuit.
Is the resistance below 5.0 ohms for either circuit?
All
Yes
→ Repair the CAN circuit(s) for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between the CAN(+) circuit and the CAN(-) circuit.
Is the resistance below 5.0 ohms between the circuits?
All
Yes
→ Repair the shorted CAN circuit(s).
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the Engine Control Module harness connector.
Disconnect the CAB harness connector.
Measure the resistance of the CAN(+) circuit.
Measure the resistance of the CAN(-) circuit.
Is the resistance above 5.0 ohms for either circuit?
All
Yes
→ Repair the CAN circuit(s) for an open
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Optional Equipment
Relay Output circuit at the CAB harness connector.
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
Yes
→ Go To 9
No
→ Repair the Fused Optional Equipment Relay Output circuit for an
open.
Perform ABS VERIFICATION TEST - VER 1.
26
BRAKES (CAB)
CAN COMMUNICATION ERROR —
Continued
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