Shift Lock System Circuit Troubleshooting

Press the brake pedal.
Are the brake lights ON?
1. YES - Go to step 2.
2. NO - Repair faulty brake light circuit.
Turn the ignition switch ON (II).
With the accelerator pedal released, press the brake pedal.
Measure the voltage between PCM connector terminal E 13 and body ground.

Fig 1: Measuring Voltage Between PCM Connector Terminal E 13 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Check for an open in the wire between PCM connector terminal E13 and the multiplex control unit. If the wire is OK, check for a loose terminal fit in the multiplex control unit connectors. If necessary, substitute a known-good multiplex control unit and recheck.
2. NO - Go to step 5.
Turn the ignition switch OFF.
Disconnect the battery negative terminal.
Disconnect PCM connectors A (31P) and E (31P).
Reconnect the battery negative terminal.
Press the brake pedal, and measure the voltage between PCM connector terminals E22 and A23 or A24.

Fig 2: Measuring Voltage Between PCM Connector Terminals E22 & A23 Or A24
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Release the brake pedal, and go to step 10.
2. NO - Repair open in the wire between PCM connector terminal E22 and the brake pedal position switch.
Measure the voltage between the No. 3 terminal of connector E (13P) and body ground.

Fig 3: Measuring Voltage Between No. 3 Terminal Of Connector E (13P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage while pushing the brake pedal?
1. YES - Release the brake pedal, and go to step 11.
2. NO - Repair open or short in the wire between the multiplex control unit and the brake pedal position switch via the No. 3 terminal of connector E (13P).
Disconnect the battery negative terminal.
Connect PCM connectors A (31P) and E (31P), and connector E (13P).
Reconnect the battery negative terminal.
Disconnect the O/D switch/shift lock solenoid/park pin switch connector (see SERVICING - A/T ).
Turn the ignition switch ON (II).
With the accelerator pedal released, press the brake pedal, and measure the voltage between the No. 4 terminal of the O/D switch/shift lock solenoid/park pin switch connector and body ground.

Fig 4: Measure Voltage Between No. 4 Terminal Of O/D Switch/Shift Lock Solenoid/Park Pin Switch Connector & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the battery voltage?
1. YES - Go to step 17.
2. NO - Repair open or short in the ire between the O/D switch/shift lock solenoid/park pin switch connector and under-dash fuse/relay box.
Measure the voltage between the No. 3 and No.4 terminals of the O/D switch/shift lock solenoid/Park pin switch connector while pressing the brake pedal.

Fig 5: Measuring Voltage Between No. 3 & No.4 Terminals Of The O/d Switch/Shift Lock Solenoid/Park Pin Switch Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 18.
2. NO - Repair open in the wire between the O/D switch/shift lock solenoid/park pin switch connector and the multiplex control unit.
Connect the battery positive terminal to the No. 4 terminal of the O/D switch/shift lock solenoid/park pin switch connector, and connect the battery negative terminal to the No. 3 terminal. Check that the shift lock solenoid operates.
NOTE: Do not connect the battery positive terminal to the No. 3 terminal or you will damage the diode inside the shift lock solenoid.

Fig 6: Identifying O/D Switch/Shift Lock Solenoid/Park Pin Switch Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the shift lock solenoid operate properly?
1. YES - Check that the shift lock mechanism work properly. If the mechanism does not work, repair or replace the shift lever assembly. If necessary, substitute a known-good multiplex control unit and recheck.
2. NO - Replace the shift lock solenoid.