Dodge Ram. Manual — part 112
Symptom:
*BRAKE WARNING INDICATOR ALWAYS ON
POSSIBLE CAUSES
BRAKE FLUID LEVEL SWITCH
BRAKE FLUID LEVEL SWITCH SENSE CIRCUIT SHORT TO GROUND
PARK BRAKE SWITCH
PARK BRAKE SWITCH SENSE CIRCUIT SHORT TO GROUND
CONTROL MODULE
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
NOTE: Diagnose and repair any MIC, Brake, or Communication DTCs
before proceeding with this test.
Disconnect the Brake Fluid Level Switch harness connector.
Measure the resistance of the Brake Fluid Level Switch between pin 1 and pin 2.
Does the resistance measure less than 900 ohms?
All
Yes
→ Replace the Brake Fluid Level Switch in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Disconnect the CAB Module harness connector, (C2 for ABS equipped vehicles).
Measure the resistance between ground and the Brake Fluid Level Switch Sense
circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Brake Fluid Level Switch Sense circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Park Brake Switch harness connector.
Turn the ignition on.
Observe the Brake warning indicator.
Did the Brake warning indicator illuminate briefly and then turn off?
All
Yes
→ Replace the Park Brake Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
445
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Park Brake Switch harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance between ground and the Park Brake Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Park Brake Switch Sense circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Reconnect any harness connector(s) that were previously disconnected.
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Fluid Level Switch state.
Does the DRBIII
t display 9Closed9?
All
Yes
→ Replace the CAB Module in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
446
INSTRUMENT CLUSTER
*BRAKE WARNING INDICATOR ALWAYS ON —
Continued
Symptom:
*BRAKE WARNING INDICATOR INOPERATIVE
POSSIBLE CAUSES
BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT OPEN
BRAKE FLUID LEVEL SWITCH
BRAKE FLUID LEVEL SWITCH SENSE CIRCUIT OPEN
PARK BRAKE SWITCH
PARK BRAKE SWITCH SENSE CIRCUIT OPEN
CONTROL MODULE
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
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?
All
Yes
→ Go To 2
No
→ Go To 4
2
Disconnect the Park Brake Switch harness connector.
Connect a jumper wire between the Park Brake Switch Sense circuit and ground.
Turn the ignition on.
Observe the BRAKE indicator.
Did the BRAKE indicator illuminate?
All
Yes
→ Replace the Park Brake Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Park Brake Switch harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the Park Brake Switch Sense circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Park Brake Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
447
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
Turn the ignition on.
Does the Brake warning indicator illuminate?
All
Yes
→ Replace the Brake Fluid Level Switch in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Measure the resistance between ground and the Brake Fluid Level Switch Ground
circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Brake Fluid Level Switch Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Disconnect the ABS Module harness connector, (C2 for ABS equipped vehicles).
Measure the resistance of the Brake Fluid Level Switch Sense circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Brake Fluid Level Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the CAB harness connector, (C2 for ABS equipped vehicles).
Connect a jumper wire between the Brake Fluid Level Switch Sense circuit and
ground.
With the DRBIII
t in Inputs/Outputs, read the Fluid Level Switch state.
Does the DRBIII
t display 9Closed9?
All
Yes
→ Replace and configure the Instrument Cluster in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the CAB Module in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
448
INSTRUMENT CLUSTER
*BRAKE WARNING INDICATOR INOPERATIVE —
Continued
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