Part 1

Horns Inoperative

Proposal Template

1. Ignition OFF, disconnect the harness connector at the [CC] [XX component].
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
3. Test for less than 10 ohm between the low reference circuit terminal [X] and ground.

• If 10 ohm or greater

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for less than 2 ohm in the low reference circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [CC] [XX] control module.

• If less than 10 ohm

4. Test for 4.8-5.2 V between the 5 V reference circuit terminal [X] and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 5 ohm in the 5 V reference circuit end to end.

• If 5 ohm or greater, repair the open/high resistance in the circuit.
• If less than 5 ohm, replace the [CC] [XX] control module.

• If greater than 5.2 V

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the [CC] [XX] control module.

• If within 4.8-5.2 V

5. Verify the scan tool [XX component] parameter is greater than 4.8 V.

• If 4.8 V or less

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for infinite resistance between the signal circuit terminal [X] and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the [CC] [XX] control module.

• If greater than 4.8 V

6. Install a 3 A fused jumper wire between the signal circuit terminal [X] and the low reference circuit terminal A.
7. Verify the scan tool [XX component] parameter is less than 1 V.

• If 1 V or greater

1. Ignition OFF, disconnect the ECU harness connector, ignition ON.
2. Test for less than 1 V between the signal circuit terminal [X] and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Test for less than 2 ohm in the signal circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [XX] control module.

• If less than 1 V

8. Test or replace the [CC] [XX component].

Circuit Function Testing
Ground Circuits

Test Example - Using a DMM
1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohm between the ground circuit terminal [X] and ground.

• If 10 ohm or greater

1. Ignition OFF
2. Test for less than 2 ohm in the ground circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.

• If less than 10 ohm

Test Example - Using a Test Lamp

Note: This test is only used when a valid continuity reading cannot be achieved.

1. Verify a test lamp illuminates between the ground circuit terminal [X] and B+.

• If the test lamp does not illuminate

1. Ignition OFF
2. Test for less than 2 ohm in the ground circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.

• If the test lamp illuminates

2. Next diagnostic step.

Low Reference Circuits

Test Example - Using a DMM
1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohm between the low reference circuit terminal [X] and ground.

• If 10 ohm or greater

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for less than 2 ohm in the low reference circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [CC] [XX] control module.

• If less than 10 ohm

The following are optional test statements that can be used when a condition can be specified that guaranties a fast test result.

Ignition OFF, key out of the ignition, all vehicle systems OFF, this may take up to 2 minutes.

or

Ignition OFF, scan tool disconnected, all vehicle systems OFF, this may take up to 2 minutes.

or

1. Ignition OFF, [XX] fuse removed, all vehicle systems OFF, this may take up to 2 minutes.
2. Test for less than 10 ohm between the low reference circuit terminal [X] and ground.

Test Example - Using a Test Lamp

Note: This test is only used when a valid continuity reading cannot be achieved.

1. Verify that a test lamp illuminates between the low reference circuit terminal [X] and B+.

• If the test lamp does not illuminate

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for less than 2 ohm in the low reference circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [CC] [XX] control module.

• If the test lamp illuminates

2. Next diagnostic step.

B+ Circuits [Battery Positive Voltage]

Test Example - Single Circuit Test
1. Verify that a test lamp illuminates between the B+ circuit terminal [X] and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF
2. Test for less than 2 ohm in the B+ circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF
2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the [CC] [component/control module].

• If the test lamp illuminates

2. Next diagnostic step.

Test Example - Circuits Downstream Of a Component Or Module That Needs To Be Tested Also
1. Verify that a test lamp illuminates between the B+ circuit terminal [X] and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF
2. Test for less than 2 ohm in the B+ circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.

• If the test lamp does not illuminate and the circuit fuse is open

1. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

Note: The vehicle may not be equipped with each circuit and components as listed below.

2. Test for infinite resistance between each circuit listed below and ground.

* Control circuit terminal 1 X1 - release/cinch motor
* Control circuit terminal 2 X1 - release/cinch motor
* Control circuit terminal 2 X1 - release/cinch motor
* Control circuit terminal 2 X3 - Liftgate motor

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the component listed below that causes the circuit fuse to open.

* [CC] [component/control module]
* [CC] [component/control module]
* [CC] [component/control module]

• If the test lamp illuminates

2. Next diagnostic step.

Ignition Circuit

Test Example - Single Circuit Test
1. Ignition ON.
2. Verify that a test lamp illuminates between the ignition circuit terminal [X] and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohm in the ignition circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the [CC] [component/control module].

• If the test lamp illuminates

Test Example - Circuits Downstream Of a Component Or Control Module That Needs To Be Tested Also
1. Ignition ON.
2. Verify that a test lamp illuminates between the ignition circuit terminal [X] and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohm in the ignition circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

Note: The vehicle may not be equipped with each circuit and components as listed below.

3. Test for infinite resistance between each of the circuits listed below and ground.

* Control circuit terminal 1 X1 - release/cinch motor
* Control circuit terminal 2 X1 - release/cinch motor
* Control circuit terminal 2 X3 - liftgate motor
* Control circuit terminal 2 X3 - liftgate motor

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the component listed below that causes the circuit fuse to open.

* [CC] [component/control module]
* [CC] [component/control module]
* [CC] [component/control module]

• If the test lamp illuminates

AC

Inverter Modules
1. Ignition ON.
2. Test for 110-120 V AC between the 115 V AC circuit terminal [X] and the Neutral AC circuit terminal [X].

• If not within 110-120 V AC

1. Ignition OFF, disconnect the harness connector at the [CC] [inverter/generator].
2. Test for infinite resistance between each AC circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohm in each AC circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [CC] [inverter/generator].

• If within 110-120 V AC

Voltage Reference Circuit
1. Ignition ON.
2. Test for 4.8-5.2 V between the 5 V reference circuit terminal [X] and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohm in the 5 V reference circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [CC] [control module].

• If greater than for 5.2 V

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the [CC] [control module].

• If within 4.8-5.2 V

Signal (Input) Circuits

Test Example - Sensor Signal Circuit Pulled Low In The Control Module
1. Ignition ON.
2. Verify the scan tool [XX] parameter is less than [XX minimum value].

• If XX or greater

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal [Y] and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the [XX] control module.

• If less than [XX]

3. Install a 3 A fused jumper wire between the signal circuit terminal [Y] and the 5 V reference circuit terminal [X].
4. Verify the scan tool [XX] parameter is greater than [XX maximum value].

• If [XX] or less

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for infinite resistance between the signal circuit terminal [Y] and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohm in the signal circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the [CC] [control module].

• If greater than [XX]

Test Example - Sensor Signal Circuit Pulled High In The Control Module
1. Ignition ON.
2. Verify the scan tool [XX] parameter is greater than [XX maximum value].

• If XX or less

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module.
2. Test for infinite resistance between the signal circuit terminal [Y] and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the [CC] [XX] control module.

• If greater than [XX]

3. Install a 3 A fused jumper wire between the signal circuit terminal [Y] and the 5 V reference circuit terminal [X].
4. Verify the scan tool [XX] parameter is less than [XX minimum value].

• If [XX] or greater

1. Ignition OFF, disconnect the harness connector at the [CC] [XX] control module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal [Y] and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. Ignition OFF