Pinpoint Test Ac: The Key-In-Ignition Chime Is Inoperative - Ford Mustang 2005 Workshop Manual

2005 Mustang Workshop Manual
Measure the resistance between the instrument cluster C220-7, circuit 1410 (TN/OG), harness side and the
message center switch C253-3, circuit 1410 (TN/OG), harness side; and between the instrument cluster C220-7,
circuit 1410 (TN/OG), harness side and ground.
Is the resistance less than 5 ohms between the instrument cluster and the message center switch, and
greater than 10,000 ohms between the instrument cluster and ground?
AB4 CHECK CIRCUIT 1411 (GY/OG) FOR AN OPEN AND A SHORT TO GROUND
Measure the resistance between the instrument cluster C220-6, circuit 1411 (GY/OG), harness side and the
message center switch C253-2, circuit 1411 (GY/OG), harness side; and between the instrument cluster C220-6,
circuit 1411 (GY/OG), harness side and ground.
Is the resistance less than 5 ohms between the instrument cluster and the message center switch, and
greater than 10,000 ohms between the instrument cluster and ground?
AB5 CHECK CIRCUITS 1410 (TN/OG) AND 1411 (GY/OG) FOR A SHORT TO VOLTAGE
Ignition ON.
Measure the voltage between the instrument cluster C220-7, circuit 1410 (TN/OG), harness side and ground; and
between the instrument cluster C220-6, circuit 1411 (GY/OG), harness side and ground.
Is any voltage present?
AB6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect the instrument cluster connector.
Check for:
corrosion
pushed-out pins
Connect the instrument cluster connector and make sure it seats correctly.
Operate the system and verify the concern is still present.
Is the concern still present?

Pinpoint Test AC: The Key-In-Ignition Chime Is Inoperative

Normal Operation
When the key is inserted into the ignition lock cylinder, the key-in-ignition switch (part of the ignition switch) closes and routes a voltage signal to the instrument cluster through circuit 1414
(LG/VT). The voltage signal indicates to the instrument cluster the key is inserted into the ignition lock cylinder. If the instrument cluster detects that the ignition switch is in the OFF or
ACC position with the key inserted in the ignition lock cylinder and the driver door is ajar, the key-in-ignition warning chime (located in the instrument cluster) sounds.
Possible Causes
circuit 1414 (LG/VT) open
key-in-ignition switch (part of the ignition switch)
instrument cluster
PINPOINT TEST AC: THE KEY-IN-IGNITION CHIME IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
AC1 CHECK FOR DRIVER DOOR AJAR INPUT TO THE SMART JUNCTION BOX (SJB)
Check the operation of the interior lamps while opening and closing the driver door.
Do the interior lamps operate correctly?
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Test Step
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the
self-test.
Yes
GO to AB5.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the
self-test.
Yes
REPAIR the circuit in question. CLEAR the DTCs.
REPEAT the self-test.
No
INSTALL a new message center switch. REFER to
Message Center Switch in this section. CLEAR the
DTCs. REPEAT the self-test.
Yes
INSTALL a new instrument cluster. REFER to
Instrument Cluster (IC) in this section. TEST the
system for normal operation.
No
The system is operating correctly at this time. The
concern may have been caused by a loose or corroded
connector. CLEAR the DTCs. REPEAT the self-test.
Result / Action to Take
Yes
GO to AC2.
No
REFER to Section 417-02 to continue diagnosis of the interior lamps.
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11/14/2009