2007 Grand Cherokee WK Factory Service Manual 8 - ELECTRICAL

B1478-CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on. Radio volume at 25 or higher.
Set Condition:
The amplifier detects that the output circuits are shorted together.

Possible Causes

(X205) AMPLIFIED LEFT REAR DOOR SPEAKER (+) CIRCUIT SHORTED TO THE (X295) AMPLIFIED LEFT REAR DOOR SPEAKER (-) CIRCUIT

AMPLIFIED LEFT REAR DOOR SPEAKER

Diagnostic Test

1. CHECK FOR AN INTERMITTENT CONDITION

Turn the ignition on, then off, and then on again.
With the scan tool, erase Amplifier DTCs.
Turn the radio on.
Turn the volume level to 25.
With the scan tool, read Amplifier DTCs.

Does the scan tool display active: B1478-CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER?

Yes

Go To 2

No

The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Perform BODY VERIFICATION TEST VER-1.

2. CHECK THE OPERATION OF THE AMPLIFIED LEFT REAR DOOR SPEAKER

Disconnect the Amplified Left Rear Door Speaker.
Measure the resistance of the speaker between the two terminals.

Is the resistance of the speaker less than 1 ohm?

Yes

Replace the Amplified Left Rear Door Speaker in accordance with the service information.
Perform BODY VERIFICATION TEST VER-1.

No

Go To 3

3. CHECK THE (X205) AMPLIFIED LEFT REAR DOOR SPEAKER (+) CIRCUIT, AND THE (X295) AMPLIFIED LEFT REAR DOOR SPEAKER (-) CIRCUITS FOR A SHORT TOGETHER

Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Measure the resistance between the (X205) Amplified Left Rear Door Speaker (+) circuit, and the (X295) Amplified Left Rear Door Speaker (-) circuit.

Is the resistance below 10K ohms?

Yes

Repair the (X205) Amplified Left Rear Door Speaker (+) circuit, and the (X295) Amplified Left Rear Door Speaker (-) circuit for a short together.
Perform BODY VERIFICATION TEST VER-1.

No

Replace the Amplifier in accordance with the service information.
Perform BODY VERIFICATION TEST VER-1.