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 DTC 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 Independent Lamp Driver Module (LDM) turns the ABS warning lamp "ON," unless the EBCM provides ground to turn it "0FF." 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.

DTC Will Set When:
DTC 11 can be set only during the three second bulb check or when the ABS warning lamp is commanded "ON." If the EBCM cannot control the ABS warning lamp for two seconds, a malfunction exists.

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 lamp functions properly. Normal operation would indicate that the problem is not present.
2. Isolates the cause of the lamp remaining "ON" to a short to voltage, a short in the EBCM or an open in CKT 39 which supplies voltage to the LDM.
3. Determines if any other DTCs are present or if DTC 11 is set falsely.
4. Ensures that the circuitry from the EBCM to the LDM is complete.
5. Determines whether the lamp remains "ON" due to a LDM malfunction or an open in CKT 852.
6. Checks to see if there is a short to voltage in CKT 852.
7. Checks for a malfunctioning EBCM.
8. Ensures that the ignition circuit to the LDM is functional. CKTs 3, 39, or 875.
9. Isolates the cause of the ABS lamp remaining "OFF" by disconnecting the 32-way EBCM connector, CKT 852 should be open and cause the ABS lamp to he "ON."
10. Isolates the cause of the lamp remaining "OFF" to a short to ground in CKT 852 or a malfunctioning LDM.
11. Checks for an open in CKT 39.
12. Determines if the "GAGES" fuse or CKT 39 is open, causing the I/P warning lamps to remain "OFF."
13. Checks for malfunctioning EBCM.
14. Determines if the "LOW TRACTION" lamp can be properly controlled.
15. Determines if the "LOW TRACTION" lamp is "ON" constantly.
16. Checks for a short to ground in the "LOW TRACTION" lamp circuitry.
17. Determines if DTC 11 was set due to a EBCM malfunction.
18. Determines if DTC 11 was set due to a EBCM malfunction.
19. Determines if the "LOW TRACTION" lamp can be controlled manually.
20. Verifies the integrity of the "LOW TRACTION" lamp circuitry.
21. Determines if there is a short to voltage in the "LOW TRACTION" lamp circuitry.
22. Determines if DTC 11 was set due to an EBCM malfunction.

Diagnostic Aids:
An "Intermittent" malfunction may be 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 he used to command the lamp "ON" while looking for an intermittent malfunction in the ABS 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.