Mode Switch Circuit Troubleshooting

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before performing repairs or service.

1. Test the mode switch (see MODE SWITCH TEST ).

   Is the switch OK? 

   1. YES  -Go to step 2.
   2. NO  -Replace the mode switch.
2. Connect the mode switch connector.
3. Remove the steering column covers, and disconnect cable reel 4P connector (see CABLE REEL REPLACEMENT ).
4. Check for continuity between cable reel 4P connector terminals No. 1 and No. 3 while pressing the S mode switch, and when the switch is released. Check for continuity between terminals No. 1 and No. 4 while pressing the D mode switch, and when the switch is released.
   Fig 1: Checking Continuity Between Cable Reel 4P Connector Terminals 1 And 3

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity while pressing each switch, and no continuity when each switch is released? 

   1. YES  -Go to step 5.
   2. NO  -Repair an open or short in the wire between the cable reel 4P connector and the switch connector, or replace the mode switch.
5. Turn the ignition switch ON (II).
6. Measure the voltage between cable reel 4P connector terminal No. 3 and body ground, and between terminal No. 4 and body ground.
   Fig 2: Measuring Voltage Between Cable Reel 4P Connector Terminal 3 And Body Ground, And Between Terminal 4 And Body Ground

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there about 10 V between each terminal and body ground? 

   1. YES  -Repair an open in the wire between cable reel 4P connector terminal No. 1 and ground, or repair poor ground (G402).
   2. NO  -Go to step 7.
7. Measure the voltage between TCM connector terminals A21 and A4 for S mode switch circuit. Measure the voltage between terminals A24 and A 4 for D mode switch circuit.
   Fig 3: Measuring Voltage Between TCM Connector Terminals A21 And A4

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there about 10 V? 

   1. YES  -Repair an open or short in the S mode switch wire between TCM connector terminal A21 and the cable reel 4P connector, and repair open or short in the D mode switch wire between terminal A24 and the cable reel 4P connector.
   2. NO  -Replace the TCM.