TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connector.
Remove the ASD Relay from the PDC.
Using a jumper wire, jumper between the Fused B+ circuit and ASD Relay Output
circuit in the PDC.
Turn the ignition on.
Measure the voltage of the Brake Switch Sense circuit in the Brake Lamp Switch
harness connector.
Is the voltage above 1.0 volts?
All
Yes
→ Repair the Brake Switch Sense circuit shorted to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Brake Switch Sense circuit in the Brake Lamp Switch
harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Brake Switch Sense circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Brake Switch Sense circuit between the Brake Lamp
Switch harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the Brake Switch Sense circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
6
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance of the Ground circuit in the Brake Lamp Switch harness
connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
7
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance between the Ground circuit terminal and the Brake Switch
Sense terminal in the Brake Lamp Switch.
Monitor Brake Switch Sense with the DRBIII
t.
Does the resistance change from below 5.0 ohms to open circuit?
All
Yes
→ Go To 8
No
→ Replace the Brake Lamp Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
144
DRIVEABILITY - SBEC
P0703-BRAKE SWITCH SENSE CIRCUIT —
Continued