DTC U1170 Loss of Driver Door Sw Asm Serial Data. Cadillac Seville 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 Body and Accessories 🢒 Body Control System 🢒 DTC U1170 Loss of Driver Door Sw Asm Serial Data

Refer to

Simple Bus Interface (SBI)

Data Link Communications Components
Data Link Communications Circuit Description
Class 2 Serial Data Line (RH Drive)
Handling ESD Sensitive Parts Notice
.

The simple bus interface (SBI) data line communicates information between the door modules. Each module connected to the SBI is assigned a recognition code, or address. This code is used in order to identify which modules are communicating. Modules communicate with each other by periodically sending state of health (SOH) messages. When the ignition switch is in RUN, each module communicating on the SBI sends a SOH message every 2 seconds. This ensures that the system is operating properly. When the front LH power window switch stops communicating the SOH messages that is normally sent disappears. The driver door module (DDM) which expects to receive that message detects the absence of the message and sets DTC U1170.

Conditions for Running the DTC

•	The DDM does not receive an SOH message back from the LH front power window switch.

•	The DTC only sets if U1300 or U1301 are not current.

Action Taken When the DTC Sets

•	DTC U1170 is stored in the DDM.

•	The DDM uses the default values for the initialization data.

•	This DTC does not cause a driver warning message to appear.

Conditions for Clearing the DTC

This DTC clears (status changes from current to history) under any of the following conditions:

•	The DDM detects an SOH message from the LH front power window switch.

•	At each ignition cycle.

Diagnostic Aids

•	DTC module U1170 does not normally represent a failure within the module.

•	If the DTC is a history DTC, the problem may be intermittent.

Step	Action	Value(s)	Yes	No
1	Did you perform Diagnostic System Check - Power Door Systems ?	--	Go to Step 2	Go to Diagnostic System Check - Power Door Systems
2	Are DTCs U1161, U1162 and U1163 also current?	--	Go to Step 6	Go to Step 3
3	Test for an open in CKT 2076 (TAN/WHT) between connector C1 terminal 15 of the driver door module (DDM) and the LH front power window switch (w/LH drive) or the RH front power window switch (w/RH drive). Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 23	Go to Step 4
4	Test the voltage and ground circuits to the LH front power window switch (w/LH drive) or the RH front power window switch (w/RH drive). Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 23	Go to Step 5
5	Replace theLH front power window switch. Refer to Front Door Switch Replacement . Is the repair complete?	--	Go to Step 23	--
6	Turn the ignition switch to OFF. Disconnect C1 of the driver door module (DDM). Turn the ignition switch ON. Measure the voltage from C1 terminal 15 of the DDM to ground. Is the voltage within the specified range?	10-15 V	Go to Step 8	Go to Step 7
7	Turn the ignition switch to OFF. Measure the resistance from C1 terminal 15 of the DDM to ground. Is the resistance within the specified range?	0-2ohms	Go to Step 9	Go to Step 10
8	Disconnect the LH front power window switch (w/LH drive) or the RH front power window switch (w/RH drive) Measure the voltage from C1 terminal 15 of the DDM to ground. Is the voltage within the specified range?	10-15 V	Go to Step 18	Go to Step 5
9	Disconnect the LH front power window switch (w/LH drive) or the RH front power window switch (w/RH drive) Measure the resistance from C1 terminal 15 of the DDM to ground. Is the resistance within the specified range?	0-2ohms	Go to Step 18	Go to Step 5
10	Turn the ignition switch ON. Measure the voltage from C1 terminal 6 of the DDM to ground. Is the voltage within the specified range?	10-15 V	Go to Step 11	Go to Step 12
11	Turn the ignition switch to OFF. Measure the resistance from C1 terminal 6 of the DDM to ground. Is the resistance within the specified range?	0-2ohms	Go to Step 15	Go to Step 19
12	Disconnect the passenger door module (PDM). Measure the voltage from C1 terminal 6 of the DDM to ground. Is the voltage within the specified range?	10-15 V	Go to Step 13	Go to Step 20
13	Disconnect the LH rear door module (LRDM). Measure the voltage from C1 terminal 6 of the DDM to ground. Is the voltage within the specified range?	10-15 V	Go to Step 14	Go to Step 21
14	Disconnect the RH rear door module (RRDM). Measure the voltage from C1 terminal 6 of the DDM to ground. Is the voltage within the specified range?	10-15 V	Go to Step 18	Go to Step 22
15	Disconnect the passenger door module (PDM). Measure the resistance from C1 terminal 6 of the DDM to ground. Is the resistance within the specified range?	0-2ohms	Go to Step 16	Go to Step 20
16	Disconnect the LH rear door module (LRDM). Measure the resistance from C1 terminal 6 of the DDM to ground. Is the resistance within the specified range?	0-2ohms	Go to Step 17	Go to Step 21
17	Disconnect the RH rear door module (RRDM). Measure the resistance from C1 terminal 6 of the DDM to ground. Is the resistance within the specified range?	0-2ohms	Go to Step 18	Go to Step 22
18	Repair the short in CKT 2076 (TAN/WHT). Refer to Wiring Repairs . Is the repair complete?	--	Go to Step 23	--
19	Replace the DDM. Refer to Door Control Module Replacement in Doors. Is the repair complete?	--	Go to Step 23	--
20	Replace the PDM. Refer to Door Control Module Replacement in Doors. Is the repair complete?	--	Go to Step 23	--
21	Replace the LRDM. Refer to Door Control Module Replacement in Doors. Is the repair complete?	--	Go to Step 23	--
22	Replace the RRDM. Refer to Door Control Module Replacement in Doors. Is the repair complete?	--	Go to Step 23	--
23	Turn the ignition switch to OFF. Reconnect or install any connectors or components that were disconnected or removed. Turn the ignition switch to ON. Clear any DTCs. Are all of the DTCs cleared?	--	Go to Diagnostic System Check - Power Door Systems	--