TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Secondary Brake Switch Signal
circuit.
Is the resistance above 100 kohms?
All
Yes
→
Go To
9
No
→
Repair the Secondary Brake Switch Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
9
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Secondary Brake Switch Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
10
No
→
Repair the Secondary Brake Switch Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
10
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
11
Disconnect the Brake Lamp Switch harness connector.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Does the test light illuminate brightly?
All
Yes
→
Go To
12
No
→
Repair the Brake Lamp Switch Fused B+ circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
12
Disconnect the Brake Lamp Switch harness connector.
Turn the ignition on.
While monitoring the PRIM BRAKE SWITCH status with the DRB, connect a
jumper wire between the Primary Brake Switch Signal circuit and the Fused B(+)
circuit.
Does the DRB display change from RELEASED to PRESSED?
All
Yes
→
Adjust or replace the Brake Lamp Switch in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To
13
160
DRIVEABILITY - DIESEL
P1703-BRAKE SIGNAL PLAUS WITH REDUNDANT CONTACT —
Continued