Scan Tool Does Not Communicate with Sensing and Diagnostic Module
SCAN TOOL DOES NOT COMMUNICATE WITH SENSING AND DIAGNOSTIC MODULE
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Was the Data Link Communications Diagnostic System Check performed? | -- | Go to Step 2 | Diagnostic System Check - Data Link Communications |
| 2 | Attempt to establish communication with the other modules connected to the circuit. * Electronic Brake Traction Control Module (EBTCM) * Heater and A/C Control * Power Steering Control Module (PSCM) Does the scan tool communicate with the other modules? |
-- | Go to Step 3 | Go to Step 20 |
| 3 | 1. Disconnect the SIR module connector. 2. Measure the resistance between the SIR module connector terminal 12 and the data link connector (DLC) terminal 12. Does the resistance measure less than the specified value? |
.5 ohms | Go to Step 5 | Go to Step 6 |
| 4 | 1. Disconnect the EBTCM connector. 2. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 7 | Go to Step 8 |
| 5 | Inspect for poor connections at terminal 12. Refer to TESTING FOR INTERMITTENTS & POOR CONNECTIONS Did you find and correct the poor connection condition? |
-- | Go to Step 9 | Go to Step 10 |
| 6 | Locate and repair an open in CKT XM10 (BRN/WHT). Is the repair complete? |
-- | Go to Step 9 | -- |
| 7 | Replace the EBTCM. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 8 | 1. Reconnect the EBTCM. 2. Disconnect connector C1 from the heater and A/C control. 3. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 12 | Go to Step 13 |
| 9 | Attempt to establish communications with the SIR module. Does the scan tool communicate with the SIR module? |
-- | System OK | -- |
| 10 | 1. Inspect and test the SIR module ignition feed circuit at terminal 5 for proper voltage with the KEY ON (11-13 V). 2. Inspect and test the SIR module ground circuit (CKT F108) at terminal 7. 3. Make necessary repairs. Did you find and correct any conditions? |
-- | Go to Step 9 | Go to Step 15 |
| 11 | Replace the PSCM. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 12 | Replace the heater and A/C control. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 13 | 1. Reconnect the heater and A/C control. 2. Disconnect the PSCM connector. 3. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 11 | Go to Step 14 |
| 14 | 1. Reconnect the PSCM. 2. Disconnect the SIR module connector. 3. Attempt to communicate with the other modules. Does the scan tool communicate with the other modules? |
-- | Go to Step 15 | Go to Step 16 |
| 15 | Replace the SIR module. Is the replacement complete? |
-- | Go to Step 9 | -- |
| 16 | 1. Disconnect each module on the serial data circuit (DLC terminal 12). 2. Test the serial data circuit, of the DLC, for a short to ground. 3. Test between terminal 12 and the following terminals at each module: * EBTCM connector terminal 11 * Heater and A/C Control connector C1 terminal 17 * SIR Module terminal 12 * PSCM connector terminal 1 Did you find a short to ground in the serial data circuit? |
-- | Go to Step 17 | Go to Step 18 |
| 17 | Locate and repair the short to ground in the serial data circuit. Is the repair complete? |
-- | Go to Step 9 | -- |
| 18 | Test the serial data circuit, of the DLC, for a short to voltage between terminal 12 and each module. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.) * EBTCM connector terminal 11 * Heater and A/C Control connector C1 terminal 17 * SIR Module terminal 12 * PSCM connector terminal 1 Did you find a short to voltage in the serial data circuit? |
-- | Go to Step 19 | Go to Step 21 |
| 19 | Locate and repair the short to voltage in the serial data circuit. Is the repair complete? |
-- | Go to Step 9 | -- |
| 20 | 1. Turn OFF the ignition. 2. Disconnect the scan tool from the data link connector (DLC). 3. Inspect for poor connections/terminal tension at the DLC terminal 12. Refer to TESTING FOR INTERMITTENTS & POOR CONNECTIONS Did you find and correct the poor connection condition? |
-- | Go to Step 2 | Go to Step 4 |
| 21 | Test the serial data circuit, of the DLC, for an open between terminal 12 and each module * EBTCM connector terminal 11 * Heater and A/C Control connector C1 terminal 17 * SIR Module terminal 12 * PSCM connector terminal 1 Did you find an open in the serial data circuit? |
-- | Go to Step 9 | -- |