TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the brake switch harness connector.
Measure the resistance between ground and the brake switch ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
5
No
→
Repair the Brake Switch Ground Circuit open.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
5
Turn the ignition off.
Disconnect the brake switch harness connector.
Using a 12-volt test light connected to ground, check the fused B(+) circuit at the
brake switch harness connector.
Is the test light on?
All
Yes
→
Go To
6
No
→
Repair the fused B(+) circuit for an open or high resistance.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
6
Turn the ignition off.
Disconnect the Brake Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn key on, engine off.
With the DRBIII
t, actuate the S/C Vacuum Solenoid.
Using a 12-volt Test Light, check the voltage of the S/C Power Supply Circuit at the
Brake Switch harness connector.
Is the light illuminated and bright?
All
Yes
→
Go To
7
No
→
Refer to symptom list for problems related to the S/C Power
Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
7
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Brake Lamp Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
8
No
→
Repair the Brake Lamp Switch Sense circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
8
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connectors.
Disconnect the CAB harness connector.
Measure the resistance between ground and the Brake Lamp Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Brake Lamp Switch Sense circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
Go To
9
285
SPEED CONTROL
*BRAKE SWITCH SENSE STATUS DOES NOT CHANGE ON DRB —
Continued