Checking Parking Brake Switch 3/272
GENERAL
Type
2 position pressure switch, spring loaded.
TERMINAL
| Terminal. connector | Control module terminal | Signal type | Miscellaneous |
|---|---|---|---|
| #C1:1 | - | Power supply, background lighting | PWM -signal via CEM |
| #C1:2 | - | Power ground | L.H.D. Left A-pillar R.H.D. Right A-pillar |
| #C1:3 | #C1:20 | Power supply A, +5V | PWM-signal f=25 Hz 33 % duty cycle |
| #C1:4 | #C1:9 | Output signal A | |
| #C1:5 | #C1:10 | Output signal C | |
| #C1:6 | #C1:19 | Output signal B | |
| #C1:7 | #C1:18 | Power supply C, +5V | PWM-signal f=25 Hz 33 % duty cycle |
| #C1:8 | #C1:11 | Power supply B, +5V | PWM-signal f=25 Hz 33 % duty cycle |
CHECK
Conditions (unless otherwise specified):
- Parking brake switch disconnected.
Check 1
Set the parking brake switch to neutral mode.
Measure the resistance between terminal #C1:3 and #C1:5. The value should be: approximately 0 ohm.
Measure the resistance between terminal #C1:8 and #C1:4. The value should be: approximately 0 ohm.
Measure the resistance between terminal #C1:7 and #C1:6. The value should be: approximately 0 ohm.
Check 2
Activate the parking brake switch by pulling the button.
Measure the resistance between terminal #C1:3 and #C1:4. The value should be: approximately 0 ohm.
Measure the resistance between terminal #C1:8 and #C1:6. The value should be: approximately 0 ohm.
Measure the resistance between terminal #C1:7 and #C1:5. The value should be: approximately 0 ohm.
Check 3
Activate the parking brake switch by pressing the button.
Measure the resistance between terminal #C1:3 and #C1:6. The value should be: approximately 0 ohm.
Measure the resistance between terminal #C1:8 and #C1:5. The value should be: approximately 0 ohm.
Measure the resistance between terminal #C1:7 and #C1:4. The value should be: approximately 0 ohm.