Fault (Trouble) Code 3/25321

This fault may also be generated if the pressure switch in the TC block is faulty. Refer to TC block test procedure.
1. With ignition in Drive position, enter ISAT command code 202. When brake pedal is applied, ISAT should display 85100; with foot off pedal, ISAT should display 8B000. Measure voltage at pin 32: this should be battery voltage when the pedal is applied and 0V with foot off. If not voltage is reaching the pin, go to step 2. If signal is correct, perform test procedure for pressure switch in TC block.
2. Check fuse No. 24. Ensure brake lights are working properly.
a. Ensure voltage is reaching brake light switch.
b. If voltage is not reaching brake light switch, check RD lead between switch and fuse holder.
3. Check lead between ECU connector pin 32 and brake light switch.
4. Perform test procedure for pressure switch in TC block (see fault code 36521).
5. Replace brake light switch.