WIS Document: 3576

| | Checking the TIP function | Important | | The following conditions must be fulfilled before activation of the TIP function in the Cruise Control system control module will be possible: | Pin A (1): 0 V | Pin B (2): approx. 12 V | Pin C (3): approx. 12 V | | 1. | Connect the BOB and check that about 12 V is present across terminals B and C of the Cruise Control connector and a good ground. Also check that no voltage (0 V) is present across terminal A and a good ground when the TIP button is held in the depressed position. | 2. | If the voltage readings are not correct, check that about 12 V is present across pin 7 of the switch connector and a good ground. If the voltage is OK, continue with point 4. | 3. | If the voltage is not OK, check the wiring for continuity or a short circuit by measuring the resistance across the load side of the fuse and pin 7 of the switch connector. If the resistance is > 1 ohm, rectify the fault. | 4. | Check the switch by holding it in the TIP position and measuring the resistance across pins 7 and 9 and also across pins 7 and 10. Hold the switch in the ON/OFF position and measure the resistance across pins 7 and 8. If the resistance reading obtained during any measurement is > 1 ohm, fit a new switch. | 5. | If the resistance is > 1 ohm, check the wiring for continuity or a short circuit by measuring the resistance across: | | • | pin 10 of the switch connector and pin B (2) of the Cruise Control connector. | | • | pin 9 of the switch connector and pin C (3) of the Cruise Control connector. | | • | pin 8 of the switch connector and pin A (1) of the Cruise Control connector. If the resistance is > 1 ohm, check the wiring and rectify the fault. | 6. | If it has not been possible to determine a fault using the above checks, continue fault diagnosis with .