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DTC P0703: Brake Switch Circuit Malfunction: Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 Suzuki Reno, 2008 Suzuki Forenza, 2007 Suzuki Reno, 2007 Suzuki Forenza, and 2006 Suzuki Reno. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING REFERENCE CHART

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD II) System Check.
Is the check completed?		 - Go to Step 2 Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK
2
  1. Install the scan tool.
  2. Turn the ignition ON. With the engine OFF.
  3. Record then clear DTC(s)
  4. Select scan tool transaxle data display.
  5. Disconnect the brake switch connector.

Did the brake switch status change from "ON" to "OFF"?		 - Go to Step 3 Go to Step 4
3
  1. Replace the brake switch.
  2. Refer to STOPLAMP SWITCH REMOVAL AND INSTALLATION .
  3. After the ignition OFF, turn ignition ON.

Is the DTC reset?		 - Go to Step 4 Go to Step 15
4 Inspect the Ef13.
Is the fuse blown?		 - Go to Step 5 Go to Step 6
5 Replace the fuse.
Is the action complete?		 - System OK -
6
  1. Turn the ignition OFF.
  2. Disconnect the C102 wiring connector and the brake switch wiring connector.
  3. Measure the resistance between the terminal 6 of the C102 connector and the terminal 2 of the brake switch wiring connector.

Is the resistance within the values shown?		 0 Ω Go to Step 8 Go to Step 7
7 Repair the open circuit between the C102 connector and the brake switch connector.
Is the action complete?		 - System OK -
8
  1. Turn the ignition ON.
  2. Measure the voltage of the C102 connector, 6 terminal.

Is the voltage within the values shown?		 11 - 14 V Go to Step 9 Go to Step 10
9 Repair the short to power between the C102 connector and the brake switch connector.
Is the action complete?		 - System OK -
10
  1. Turn the ignition OFF.
  2. Disconnect the brake switch wiring connector and TCM wiring connector.
  3. Measure between the brake switch connector, terminal 4 and TCM connector, terminal A5.

Is the resistance within the values shown?		 0 Ω System OK Go to Step 11
11 Repair the open or short to ground between brake switch connector and TCM.
Is the action complete?		 - System OK -
12
  1. Turn the ignition ON.
  2. Measure the voltage of the brake switch wiring connector, terminal 4.

Is the voltage within the values shown?		 11 - 14 V Go to Step 13 Go to Step 13
13 Repair the short to power between the brake switch wiring connector and TCM.
Is the action complete?		 - System OK -
14 Replace the TCM.
Is the action complete?		 - Go to Step 15 -
15
  1. After the repair, use a scan tool "clear info" function and road test the vehicle.
  2. Review the "DTC info".

Has the last test failed or is the current DTC displayed?		 - Begin diagnosis again Repair verified exit DTC chart
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