DTC 11
11 ABS WARNING LAMP CIRCUIT MALFUNCTIONFig 165 Code 11: Warning Light Open Or Shorted To Ground:
DTC 11 ABS Warning Lamp Circuit Open Or Shorted To Ground:
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 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.
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. Determines if any other DTCs are present or if DTC 18 is set falsely.
3. Ensures that the circuitry from the EBCM to the lamp driver module is complete.
4. Ensures that the ignition circuit to the lamp driver module is functional. An open indicator fuse or open CKT 3, 39 or 875 would result in inoperative indicator lamp.
5. Isolates the cause of the ABS lamp remaining "OFF," by disconnecting the 24-way EBCM connector, CKT 852 should be open and cause the ABS lamp to be "ON."
6. Determines whether the lamp remains "ON" due to a lamp driver malfunction or an open in CKT 852.
7. Determines if the "INDIC" fuse or CKT 3 is open, causing the I/P indicator lamps to remain
8. Checks for an open in CKT 39 which supplies voltage to the lamp driver module.
9. Isolates the cause of the lamp remaining "OFF" to a short to ground in CKT 852 or a malfunctioning lamp driver module.
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 be 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.