Dodge Ram Truck 1500-2500-3500. Manual — part 379
*BRAKE WARNING INDICATOR INOPERATIVE (CONTINUED)
For the Instrument Cluster circuit diagram (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - SCHEMATICS
AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(Z420) BRAKE FLUID LEVEL SENSOR GROUND CIRCUIT OPEN
(B25) PARK BRAKE SWITCH SENSE CIRCUIT OPEN
(B20) BRAKE FLUID LEVEL SENSE CIRCUIT OPEN
PARK BRAKE SWITCH
BRAKE FLUID LEVEL SENSOR
ANTI-LOCK BRAKES MODULE
INSTRUMENT CLUSTER
Diagnostic Test
1.
FAULT LOCATION
NOTE: Diagnose and repair any MIC, ABS, or Communication DTCs before proceeding with this test.
Is the Brake warning indicator only inoperative using the Park Brake?
Yes
>> Go To 2
No
>> Go To 4
2.
PARK BRAKE SWITCH
Disconnect the Park Brake Switch harness connector.
Connect a jumper wire between the (B25) Park Brake Switch Sense
circuit and ground.
Turn the ignition on.
Observe the BRAKE indicator.
Did the BRAKE indicator illuminate?
Yes
>> Replace the Park Brake Switch in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 3
8J - 76
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
DR/DH
*BRAKE WARNING INDICATOR INOPERATIVE (CONTINUED)
3.
(B25) PARK BRAKE SWITCH SENSE CIRCUIT OPEN
Turn the ignition off.
Disconnect the (B25) Park Brake Switch harness connector.
Disconnect the Instrument Cluster C3 harness connector.
Measure the resistance of the (B25) Park Brake Switch Sense circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (B25) Park Brake Switch Sense circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Replace and configure the Instrument Cluster in accor-
dance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
4.
BRAKE FLUID LEVEL SENSOR
Turn the ignition off.
Disconnect the Brake Fluid Level Sensor harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
Turn the ignition on.
Does the Brake warning indicator illuminate?
Yes
>> Replace the Brake Fluid Level Sensor in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 5
DR/DH
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
8J - 77
*BRAKE WARNING INDICATOR INOPERATIVE (CONTINUED)
5.
(Z420) BRAKE FLUID LEVEL SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Brake Fluid Level Sensor harness connector.
Measure the resistance between ground and the (Z420) Brake Fluid
Level Sensor Ground circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (Z420) Brake Fluid Level Sensor Ground circuit
for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 6
6.
(B20) BRAKE FLUID LEVEL SENSE CIRCUIT OPEN
Turn the ignition off.
Disconnect the Brake Fluid Level Sensor harness connector.
Disconnect the Anti-lock Brakes Module harness connector.
Measure the resistance of the (B20) Brake Fluid Level Sensor Sense
circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (B20) Brake Fluid Level Sensor Sense circuit
for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 7
8J - 78
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
DR/DH
*BRAKE WARNING INDICATOR INOPERATIVE (CONTINUED)
7.
INSTRUMENT CLUSTER
Turn the ignition off.
Disconnect the Anti-lock Brakes Module harness connector.
Connect a jumper wire between the (B25) Brake Fluid Level Sensor
Sense circuit and ground.
With the DRBIII
T
in Inputs/Outputs, read the Brake Fluid Level Sensor
state.
Does the DRBIII
T
display
(
Closed
(
?
Yes
>> Replace and configure the Instrument Cluster in accor-
dance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Replace the Anti-lock Brakes Module in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
DR/DH
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
8J - 79
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