DTC 11

DTC 11 ABS Warning Lamp Circuit Malfunction (Part 1 Of 2):

DTC 11 ABS Warning Lamp Circuit Malfunction (Part 2 Of 2):

DTC 11 ABS Warning Lamp Circuit Malfunction:

Circuit Description:
This test checks the state of the ABS warning lamp to identify a situation in which the driver could not be warned of a system malfunction by the ABS warning lamp, or the warning lamp is always "ON." The Lamp Driver Module (LDM) turns the ABS warning lamp "ON," unless the EBCM provides ground to turn it "OFF." Because of the circuitry in the LDM, only external malfunctions can be detected. As a result, the ABS warning lamp itself is not diagnosable, only the control line to the EBCM can be diagnosed. In the event of an open CKT 852, the ABS warning lamp will be "ON" at all times, due to the loss of ground at the LDM input. If the control line is shorted to ground, the ABS warning lamp is kept "OFF," due to the LDM input being grounded. If the control line is shorted to B+, the EBCM cannot command the ABS warning lamp "OFF."

DTC Will Set When:
DTC 11 can be set anytime. Opens or shorts to ground are detected during the three second bulb check. Shorts to battery are detected when the EBCM commands the ABS warning lamp "OFF."

Action Taken:
A malfunction DTC is stored; however, ABS is not disabled.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks to see if ABS warning lamp functions properly. Normal operation would indicate that the malfunction is not present.
2. Checks for a short to B+ in the ABS warning lamp control circuit.
3. Determines whether the short to B+ is in the LDM or the ABS warning lamp control circuit.
4. Checks for an open in the ABS warning lamp control circuit.
5. Checks to see if the malfunction was due to a poor connection.
6. Checks for a possible short to ground in the EBCM.
7. Check for a possible short to ground in the ABS warning lamp control circuit.
8. Checks for high resistance in the LDM power feed circuit.
9. Ensures malfunction was not due to physical damage of the circuitry.
10. Checks for a malfunction in the LDM power feed circuit.

Diagnostic Aids:
An "Intermittent" malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The lamp test function of the Tech 1 may be used to command the lamp "ON" while looking for an intermittent malfunction in the warning lamp circuitry.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

Any circuitry that is suspected as causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.