PINPOINT TEST B : HORN DOES NOT SOUND |
TEST CONDITIONS | DETAILS/RESULTS/ACTIONS |
B1: CHECK THE HORN RELAY |
| 1 Disconnect Horn Relay C69. |
| 2 Carry out the relay component test. REFER to Horn Relay in this section. |
| Is the relay OK? Yes No INSTALL a new horn relay. TEST the system for normal operation. |
B2: CHECK POWER TO THE HORN RELAY |
| 1 Measure the voltage between the horn relay C69 pin 2, harness side and ground; and between horn relay C69 pin 3, harness side and ground. |
| Are the voltages greater than 10 volts? Yes No If fuse F12 is OK, REPAIR the power feed to the horn relay. If fuse F12 has failed, INSTALL a new fuse. TEST the system for normal operation. If the fuse fails again, REPAIR the power feed to the horn relay. TEST system for normal operation. |
B3: CHECK THE HORN CIRCUIT |
| 1 Measure the resistance between the horn relay C69 pin 5, circuit 29S-ME6 (OG/YE), harness side and ground. |
| Is the resistance between 0.5 and 4.0 ohms? Yes No REPAIR circuit 29S-ME6. TEST the system for normal operation. |
B4: CHECK POWER TO HORN SWITCH |
| 1 Connect Horn Relay C69. |
| 2 Disconnect Air Bag Sliding Contact C896. |
| 3 Remove the steering column lower shroud. |
| 4 Measure the voltage between the air bag sliding contact C896 pin 2, circuit 31S-ME7 (BK/BU), harness side and ground. |
| Is the voltage greater than 10 volts? Yes No REPAIR circuit 31S-ME7. TEST the system for normal operation. |
B5: CHECK THE HORN SWITCH GROUND CIRCUIT |
| 1 Measure the resistance between the air bag sliding contact C896 pin 1, circuit 31-PG13 (BK). harness side and ground. |
| Is the resistance less than 5 ohms? Yes No If equipped with speed control, GO to B7. GO to Pinpoint Test B. Otherwise, REPAIR circuit 31-PG13. TEST the system for normal operation. |
B6: CHECK THE HORN SWITCH |
WARNING:To deactivate the air bag, refer to the procedure in Section 501-20B for the correct air bag deactivation procedure. |
| 1 |
| 2 Disconnect Horn Switch N78. |
| 3 Measure the resistance between the horn switch pins. Take note of the reading with the switch pressed as well as with the switch released. |
| Is the resistance greater than 10,000 ohms with the switch released and less than 5 ohms with the switch pressed? Yes Install a new air bag sliding contact. TEST the system for normal operation. No INSTALL new horn switch(es). TEST the system for normal operation. |
B7: CHECK THE GROUND TO THE HORN SWITCH |
| 1 Disconnect Speed Control Module C833. |
| 2 Measure the resistance between the speed control module C833 pin 10, circuit 91-PG12 (BK/WH), harness side and ground. |
| Is the resistance less than 5 ohms? Yes REPAIR circuit 31-PG13. TEST the system for normal operation. No REPAIR circuit 91-PG12. TEST the system for normal operation. |