Test Procedure

AI1 CHECK FOR DTCS

Are DTCs P0504, P0572, P0573 or P1703 present?

Yes	No
For KOER DTC P1703, GO to AI2 . For all others, GO to AI3.	Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. RETURN to SYMPTOM CHARTS for further direction.

AI2 VERIFY THE BRAKE PEDAL WAS APPLIED

Was the brake pedal applied and released during the KOER self-test?

Yes	No
GO to AI3 .	REPEAT the KOER self-test. APPLY and RELEASE the brake pedal during the KOER test. Clear the PCM DTCs. REPEAT the self-test.

AI3 CHECK THE OPERATION OF THE STOPLAMPS

Ignition ON, engine OFF.
Apply and release the brake pedal and check the stoplamp operation.

Do the stoplamps operate correctly?

Yes	No
GO to AI4 .	REFER to the service information , Exterior Lighting, to diagnose all the stoplamps are inoperative. Clear the PCM DTCs. REPEAT the self-test.

AI4 CHECK THE BRAKE SWITCH OPERATION

Access the PCM and monitor the BOO1 (MODE) PID.
Apply and release the brake pedal while monitoring the brake position PID.

Does the BOO1 PID state change when the brake pedal is fully applied and released?

Yes	No
Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to AI5 .

AI5 CHECK FOR BPP CIRCUIT CYCLING

Ignition OFF.
PCM-B connector disconnected.
Ignition ON, engine OFF.
Fully apply and release the brake pedal while measuring the voltage.

Measure the voltage between:

(+) PCM-B Connector, Harness Side	(-)
BPP - Pin 13	Ground

Is voltage less than 1 volt with the brake pedal released and greater than 10.5 volts with the brake pedal fully applied?

Yes	No
GO to AI6 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AI6 CHECK FOR BPS CIRCUIT CYCLING

Fully apply and release the brake pedal while measuring the resistance.

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-)
BPS - Pin 46	Ground

Is the resistance less than 5 ohms with brake pedal released and greater than 10, 000 ohms with the brake pedal pressed?

Yes	No
GO to AI7 .	GO to AI11.

AI7 CHECK THE BPP SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.
BPP Switch connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) BPP Switch Connector, Harness Side	(-)
BPP - Pin 4	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to AI8 .

AI8 CHECK THE BPP SWITCH FOR VOLTAGE

Measure the voltage between:

(+) BPP Switch Connector, Harness Side	(-)
B+ - Pin 1	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to AI9 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AI9 CHECK THE BPP SWITCH SIGNAL

Ignition OFF.
PCM-B connector connected.
Ignition ON, engine OFF.
Access the PCM and monitor the BOO1 (MODE) PID.

Connect a 5 amp fused jumper wire between the following:

Point A BPP Switch Connector, Harness Side	Point B BPP Switch Connector, Harness Side
B+ - Pin 1	BPP - Pin 4

Does the BOO1 PID indicate ON?

Yes	No
INSTALL a new BPP switch. Clear the PCM DTCs. REPEAT the self-test.	GO to AI10 .

AI10 CHECK THE BPP SWITCH INPUT CIRCUIT FOR AN OPEN

Ignition OFF.
PCM-B connector disconnected.

Measure the resistance between:

(+) BPP Switch Connector, Harness Side	(-) PCM-B Connector, Harness Side
BPP - Pin 4	BPP - Pin 13

Is the resistance less than 5 ohms?

Yes	No
GO to AI11 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AI11 CHECK THE BPP SWITCH FOR CORRECT OPERATION

Ignition OFF.
BPP Switch connector disconnected.
Fully apply and release the brake pedal while measuring the resistance.

Measure the resistance between:

(+) BPP Switch Connector, Component Side	(-) BPP Switch Connector, Component Side
BPS - Pin 2	GND - Pin 3

Is the resistance less than 5 ohms with the brake pedal released and greater than 10, 000 ohms with the brake pedal pressed?

Yes	No
GO to AI12 .	INSTALL a new BPP switch. Clear the PCM DTCs. REPEAT the self-test.

AI12 CHECK THE BPS AND BPP CIRCUITS FOR AN OPEN

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-) BPP Switch Connector, Harness Side
BPS - Pin 46	BPS - Pin 2

Measure the resistance between:

(+) BPP Switch Connector, Harness Side	(-)
GND - Pin 3	Ground

Are the resistances less than 5 ohms?

Yes	No
GO to AI13 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

AI13 CHECK THE BPS CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) PCM-B Connector, Harness Side	(-)
BPS - Pin 46	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to AI14 .	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

AI14 CHECK THE BPS CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) PCM-B Connector, Harness Side	(-)
BPS - Pin 46	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to AI15 .

AI15 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.